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					                                    SSMRS DATA SHEET No. 1 CONVERSION TABLE PROTOTYPE TO S SCALE
PROTOTYPE                   SCALE SIZE                  PROTOTYPE                   SCALE SIZE                 PROTOTYPE                     SCALE SIZE
Feet Inches   Fractions     Decimals of   Millimetres   Feet Inches   Fractions      Decimals    Millimetres   Feet Inches   Fractions      Decimals of Millimetres
              of inches     inches                                    of inches      of inches                               of inches      inches
    1/16           1/1024        0.0010       0.0248      3   3             39/64         0.6094      15.478      6   10          1 9/32          1.2813      32.544
    1/8             1/512        0.0020       0.0496      3   4               5/8         0.6250      15.875      6   11        1 19/64           1.2969      32.941
    1/4             1/256        0.0039       0.0992      3   5             41/64         0.6406      16.272      7   0           1 5/16          1.3125      33.338
    1/2             1/128        0.0078       0.1984      3   6             21/32         0.6563      16.669      7   1         1 21/64           1.3281      33.734
    3/4             3/256        0.0117       0.2977      3   7             43/64         0.6719      17.066      7   2         1 11/32           1.3438      34.131
    1                1/64        0.0156       0.3969      3   8             11/16         0.6875      17.463      7   3         1 23/64           1.3594      34.528
    2                1/32        0.0313       0.7938      3   9             45/64         0.7031      17.859      7   4            1 3/8          1.3750      34.925
    3                3/64        0.0469        1.191      3   10            23/32         0.7188      18.256      7   5         1 25/64           1.3906      35.322
    4                1/16        0.0625        1.588      3   11            47/64         0.7344      18.653      7   6         1 13/32           1.4063      35.719
    5                5/64        0.0781        1.984      4   0               3/4         0.7500      19.050      7   7         1 27/64           1.4219      36.116
    6                3/32        0.0938        2.381      4   1             49/64         0.7656      19.447      7   8           1 7/16          1.4375      36.513
    7                7/64        0.1094        2.778      4   2             25/32         0.7813      19.844      7   9         1 29/64           1.4531      36.909
    8                 1/8        0.1250        3.175      4   3             51/64         0.7969      20.241      7   10        1 15/32           1.4688      37.306
    9                9/64        0.1406        3.572      4   4             13/16         0.8125      20.638      7   11        1 31/64           1.4844      37.703
    10               5/32        0.1563        3.969      4   5             53/64         0.8281      21.034      8   0            1 1/2          1.5000      38.100
    11              11/64        0.1719        4.366      4   6             27/32         0.8438      21.431      8   1         1 33/64           1.5156      38.497
    12               3/16        0.1875        4.763      4   7             55/64         0.8594      21.828      8   2         1 17/32           1.5313      38.894
1   1               13/64        0.2031        5.159      4   8               7/8         0.8750      22.225      8   3         1 35/64           1.5469      39.291
1   2                7/32        0.2188        5.556      4   9             57/64         0.8906      22.622      8   4           1 9/16          1.5625      39.688
1   3               15/64        0.2344        5.953      4   10            29/32         0.9063      23.019      8   5         1 37/64           1.5781      40.084
1   4                 1/4        0.2500        6.350      4   11            59/64         0.9219      23.416      8   6         1 19/32           1.5938      40.481
1   5               17/64        0.2656        6.747      5   0             15/16         0.9375      23.813      8   7         1 39/64           1.6094      40.878
1   6                9/32        0.2813        7.144      5   1             61/64         0.9531      24.209      8   8            1 5/8          1.6250      41.275
1   7               19/64        0.2969        7.541      5   2             31/32         0.9688      24.606      8   9         1 41/64           1.6406      41.672
1   8                5/16        0.3125        7.938      5   3             63/64         0.9844      25.003      8   10        1 21/32           1.6563      42.069
1   9               21/64        0.3281        8.334      5   4                 1         1.0000      25.400      8   11        1 43/64           1.6719      42.466
1   10              11/32        0.3438        8.731      5   5            1 1/64         1.0156      25.797      9   0         1 11/16           1.6875      42.863
1   11              23/64        0.3594        9.128      5   6            1 1/32         1.0313      26.194      9   1         1 45/64           1.7031      43.259
2   0                 3/8        0.3750        9.525      5   7            1 3/64         1.0469      26.591      9   2         1 23/32           1.7188      43.656
2   1               25/64        0.3906        9.922      5   8            1 1/16         1.0625      26.988      9   3         1 47/64           1.7344      44.053
2   2               13/32        0.4063       10.319      5   9            1 5/64         1.0781      27.384      9   4            1 3/4          1.7500      44.450
2   3               27/64        0.4219       10.716      5   10           1 3/32         1.0938      27.781      9   5         1 49/64           1.7656      44.847
2   4                7/16        0.4375       11.113      5   11           1 7/64         1.1094      28.178      9   6         1 25/32           1.7813      45.244
2   5               29/64        0.4531       11.509      6   0             1 1/8         1.1250      28.575      9   7         1 51/64           1.7969      45.641
2   6               15/32        0.4688       11.906      6   1            1 9/64         1.1406      28.972      9   8         1 13/16           1.8125      46.038
2   7               31/64        0.4844       12.303      6   2            1 5/32         1.1563      29.369      9   9         1 53/64           1.8281      46.434
2   8                 1/2        0.5000       12.700      6   3          1 11/64          1.1719      29.766      9   10        1 27/32           1.8438      46.831
2   9               33/64        0.5156       13.097      6   4            1 3/16         1.1875      30.163      9   11        1 55/64           1.8594      47.228
2   10              17/32        0.5313       13.494      6   5          1 13/64          1.2031      30.559     10   0            1 7/8          1.8750      47.625
2   11              35/64        0.5469       13.891      6   6            1 7/32         1.2188      30.956    100   0           18 3/4         18.7500     476.250
3   0                9/16        0.5625       14.288      6   7          1 15/64          1.2344      31.353    500   0           93 3/4         93.7500    2381.250
3   1               37/64        0.5781       14.684      6   8             1 1/4         1.2500      31.750   1000   0         187 1/2         187.5000    4762.500
3   2               19/32        0.5938       15.081      6   9          1 17/64          1.2656      32.147      1   mile         82’-6”          82’-6” 25146.000
The    S       Scale Model Railway Society
      SSMRS DATA SHEET No. 2 – STRUCTURAL CLEARANCES
The            S                Scale Model Railway Society
                                       SSMRS DATA SHEET No. 3
                    STANDARD GAUGE WHEEL AND TRACK STANDARDS




          Radius of Curve           Track gauge           Flangeway
     Prototyp    S Scale        Prototyp    S Scale   Prototyp   S Scale
     e                          e                     e
A    Straight    Straight       4’-8½”      0.884”    1.80”      0.028”
B    10-7ch      10’3” – 7’2”   4’-8¾”      0.888”    2.05”      0.032”
C    7-5½ ch     7’2” – 5’8”    4’-9”       0.892”    2.30”      0.036”
D    <5½ ch      <5’8”          4’-9¼”      0.896”    2.56”      0.040”

                                     Imperial            Metric
BB      Back to Back                 0.838”              21.29mm
CC      Check Clearance              0.856”              21.74mm
TW      Tyre Width                   0.086”               2.18mm
T       Tread Width                  0.068”               1.73mm
FD      Flange Depth                 0.018”              0.46mm
F       Flange Width                 0.018”              0.46mm

TG      Track Gauge                  0.884”              22.45mm
FW      Crossing Flangeway           0.028”               0.71mm
CG      Check Gauge                  0.856”              21.74mm
 The            S               Scale Model Railway Society
                       SSMRS DATA SHEET No. 4 – TURNOUT DIMENSIONS

Turnouts are generally referred to in the UK by combining their Switch types (for example A, B, C) and their crossing
angle, (for example"1 in 4"” "1 in 6”) to give a name such as A4 or B6. Prototype turnouts are built up wherever
possible from standard units, the vee crossing and the switches. Closure rails link these units to complete the formation.
The dimension from the toe, that is the tip of the switch blade, to the nose of the crossing is referred to as the “lead” of
the turnout.

The radius of a turnout will never be greater than that of the switch radius. If a finer angle of crossing than standard is
required a straight length of closure rail is inserted at the crossing end. When the switch and turnout radii coincide the
turnout is referred to as “natural”. A sharper than natural turnout will have two radii, whilst a larger than natural turnout
(for example a B10) will have a straight insert in the closure rails.

Modellers are advised to obtain photographs wherever possible of the type of formation that they wish to build.

Railway companies used different methods of arranging the long 12  6 inch sleepers. Some companies placed the
timbers at right angles to the main route but the Great Western together with a few others located their timbers at right
angles to a centreline drawn through the crossing vee. The “A” switch was not used by the GWR.




Switch        Prototype             “S” gauge               Prototype           “S” Gauge Lead                Remarks
Type           Turnout            Turnout radius              Lead
                radius
                (feet)       (inches)        (metres)        feet ins        (inches)        (mm)

Switch Rail radius 482’-0” (90.375”) in S scale. Switch rail length 20’-0” (3.750” in S scale)

A4               130         24.375           0.619           42’-8”          8.000          203.2

A4½              168         31.500           0.800          44’-10”          8.406          213.5

A5               212         39.750           1.010          46’-10”          8.781          223.0

A5½              264         49.500           1.257           48’-9”          9.141          232.2

A6               326         61.125           1.553           50’-7”          9.484          240.9

A6½              398         74.625           1.895           52’-4”          9.812          249.2

A7               482         90.375           2.296           54’-0”         10.125          257.2      Natural Turnout

A7½              482         90.375           2.296           54’-2”         10.156          258.0      Straight section

A8               482         90.375           2.296           54’-7”         10.234          260.0      Straight section
Switch       Prototype             “S” gauge              Prototype          “S” Gauge Lead             Remarks
Type          Turnout            Turnout radius             Lead
               radius
               (feet)       (inches)        (metres)       Feet ins       (inches)        (mm)

Switch Rail radius 613’-0” (114.937”) in S scale. Switch rail length 22’-6” (4.219” in S scale)

B6              312         58.500           1.486          56’-8”         10.625        269.9

B6½             374         70.125           1.781         58’-10”         11.031        280.2

B7              445         83.437           2.119         60’-10”         11.406        289.7

B7½             524         98.250           2.496          62’-9”         11.766        298.9

B8              613         114.937          2.919          64’-7”         12.109        307.6     Natural Turnout

B9              613         114.937          2.919          65’-2”         12.219        310.4     Straight section

B10             613         114.937          2.919          66’-6”         12.469        316.7     Straight section



Switch Rail radius 960’-0” (180.000”) in S scale. Switch rail length 28’-6” (5.344” in S scale)

C7              416         78.000           1.981         68’-11”         12.922        328.2

C7½             485         90.937           2.310          71’-0”         13.312        338.1

C8              562         105.375          2.677          73’-1”         13.703        348.1

C9              740         138.750          3.524          77’-1”         14.453        367.1

C10             960         180.000          4.572          80’-9”         15.141        384.6     Natural Turnout

C12             960         180.000          4.572          82’-5”         15.453        392.5     Straight section



Switch Rail radius 1379’-0” (180.000”) in S scale. Switch rail length 28’-6” (5.344” in S scale)

D8              545         102.187          2.596          80’-2          15.000        381.0

D9              707         132.562          3.367          84’-7”         15.879        403.3

D10             896         168.000          4.267         88’-11”         16.672        423.5
 The             S               Scale Model Railway Society
           SSMRS DATA SHEET No. 5 – CONVERTING 4mm and 7mm DRAWINGS

These notes may be useful to those members who wish to convert 4 or 7mm to one foot scale drawings to 3/16” to one
foot (1:64) scale.

Reference to the conversion tables can be worthwhile when re-scaling drawings of rolling stock and buildings but is not
recommended for non-rectilinear items such as locomotive chimneys and safety valve casings.

If the measurement of one foot in each of the scales is taken as inches then by division the equivalent can be found for
the other scales thus:

                   1 foot = 0.15748” (4mm scale)
                   1 foot = 0.1875” (S Scale)
                   1 foot = 0.27559” (7mm scale)

This gives the relationships:

                   0.010” in 4mm scale = 0.0119” in S scale
                   0.010” in 7mm scale = 0.0068” in S scale

The table overleaf gives equivalents in 0.020” (20 thou) steps.

Examples of using the tables:
If a scale rule is taken with inches divided into 1/10” parts (0.10”), further subdivided into five equal parts as 1/50”
(0.020”), these divisions can be divided by eye to approximately 0.005” (five thou).




In the diagram the dimensions can be read as 1 inch + 0.100 +0.006 (3 divisions) + 0.015 (approx. ¾ division) which
totals 1.175”.

If this is taken from a 4mm drawing:                             If this is taken from a 7mm drawing:

1.100” in 4mm scale = 1.310” in S scale                          1.100” in 7mm scale = 0.748” in S scale
0.060” in 4mm scale = 0.072” in S scale                          0.060” in 7mm scale = 0.041” in S scale
0.010” in 4mm scale = 0.012” in S scale                          0.010” in 7mm scale = 0.007” in S scale
0.005” in 4mm scale = 0.006” in S scale                          0.005” in 7mm scale = 0.003” in S scale
Total              = 1.400” in S scale                           Total              = 0.799” in S scale
4mm scale to S scale
4mm        S           4mm       S     4mm       S      4mm        S
0.005    0.006         0.380   0.452   0.780   0.929    1.900    2.262
0.010    0.012         0.400   0.476   0.800   0.953    2.000    2.381
0.020    0.024         0.420   0.500   0.820   0.976    2.100    2.500
0.040    0.048         0.440   0.524   0.840   1.000    2.200    2.619
0.060    0.071         0.460   0.548   0.860   1.024    2.300    2.738
0.080    0.095         0.480   0.572   0.880   1.048    2.400    2.858
0.100    0.119         0.500   0.595   0.900   1.072    2.500    2.977
0.120    0.143         0.520   0.619   0.920   1.095    2.600    3.096
0.140    0.167         0.540   0.643   0.940   1.119    2.700    3.215
0.160    0.191         0.560   0.667   0.960   1.143    2.800    3.334
0.180    0.214         0.580   0.691   0.980   1.167    2.900    3.453
0.200    0.238         0.600   0.714   1.000   1.191    3.000    3.572
0.220    0.262         0.620   0.738   1.100   1.310    4.000    4.763
0.240    0.286         0.640   0.762   1.200   1.429    5.000    5.953
0.260    0.310         0.660   0.786   1.300   1.548    6.000    7.144
0.280    0.333         0.680   0.810   1.400   1.667    7.000    8.334
0.300    0.357         0.700   0.833   1.500   1.786    8.000    9.525
0.320    0.381         0.720   0.857   1.600   1.905    9.000   10.716
0.340    0.405         0.740   0.881   1.700   2.024   10.000   11.906
0.360    0.429         0.760   0.905   1.800   2.143   50.000   59.531

7mm scale to S scale
7mm        S           7mm       S     7mm       S      7mm        S
0.005    0.003         0.380   0.259   0.780   0.531    1.900    1.293
0.010    0.007         0.400   0.272   0.800   0.544    2.000    1.361
0.020    0.014         0.420   0.286   0.820   0.558    2.100    1.429
0.040    0.027         0.440   0.299   0.840   0.572    2.200    1.497
0.060    0.041         0.460   0.313   0.860   0.585    2.300    1.565
0.080    0.054         0.480   0.327   0.880   0.599    2.400    1.633
0.100    0.068         0.500   0.340   0.900   0.612    2.500    1.701
0.120    0.082         0.520   0.354   0.920   0.626    2.600    1.769
0.140    0.095         0.540   0.367   0.940   0.640    2.700    1.837
0.160    0.109         0.560   0.381   0.960   0.653    2.800    1.905
0.180    0.122         0.580   0.395   0.980   0.667    2.900    1.973
0.200    0.136         0.600   0.408   1.000   0.680    3.000    2.041
0.220    0.150         0.620   0.422   1.100   0.748    4.000    2.721
0.240    0.163         0.640   0.435   1.200   0.816    5.000    3.402
0.260    0.177         0.660   0.449   1.300   0.884    6.000    4.082
0.280    0.191         0.680   0.463   1.400   0.953    7.000    4.763
0.300    0.204         0.700   0.476   1.500   1.021    8.000    5.443
0.320    0.218         0.720   0.490   1.600   1.089    9.000    6.123
0.340    0.231         0.740   0.503   1.700   1.157   10.000    6.804
0.360    0.245         0.760   0.517   1.800   1.225   50.000   34.018
 The         S               Scale Model Railway Society
                               SSMRS DATA SHEET No. 6
              CONVERSION TABLE FOR COMMERCIAL WHEELS
CODE        Crank Pin -        PB        Standard wheel with crank pin between spokes
                               IL        Standard wheel with crank pin in line with spokes

            Type -             P         Plain wheel –no crank pin
                               Dr        Driving wheel

Notes: Both Sharman profiles (A and B) have been used for S scale.
Remember that prototype wheels could be up to 3” below their stated diameter due to tyre wear

      Diameter           Crank Throw       Spokes    Crank        Type               References
 S Scale      4mm    S Scale     4mm                  Pin
  1’-8”      2’-0”      -         -           8         -           P                        M390
 1’-10¾      2’-3”      -         -           8         -           P                        S392
                       13”       15”          6        IL          Dr                        S10
                        -         -         Disc        -           P                        M12
  2’-1”      2’-6”      -         -           8         -           P                        M16
                       15”       18”        Disc        -          Dr                        M14
                       15”       18”         10         -          Dr                        S400
 2’-2½”      2’-8”      -         -           8         -           P        G4831
                        -         -          10         -           P        G4832
                        -         -           8         -           P                        S18
                        -         -           9         -           P                        M402
 2’-3¾”      2’-9”      -         -          10         -           P                        M20
                        -         -          12         -           P                        M406
                       10”       12”          8        PB          Dr                        M22
                        -         -         Disc        -           P                        M24
                        -         -           8         -           P        G4836H          S27
                        -         -           9         -        Bevel       G4836ST         S28
                        -         -           9         -           P        G4836P          S30
                        -         -          10         -           P        G4836           L32
  2’-6”      3’-0”      -         -          12         -           P        G4836C
                       15”       18”        Disc        -          Dr        G4836P          S26
                       13”       15”          8        IL          Dr                        M34
                       15”       18”          8        IL          Dr        G4836IW
                       13”       15”          9        PB          Dr        G4836E
                       15”       18”         10        PB          Dr        G4836H          M36
                        -         -         Disc        -        Bullied                     M38
                        -         -           8         -           P                        M40
  2’-7”      3’-1”      -         -          10         -           P                        L42
                        -         -          12         -           P                        M44
                       13”       15”          8        IL       M. Wardle                    M46
                        -         -         Disc        -           P        G4838W
  2’-8”      3’-2”      -         -           9         -           P        G4838ST/T
                        -         -          10         -           P        G4838           M48
                        -         -          10         -        Bevel       G4838ST
                        -         -         Disc       IL           P                        M50
                        -         -           8         -           P        G4839H          M52
 2’-8¾”      3’-3”      -         -          10         -           P        G4839           S54
                        -         -          10         -        Bevel       G4839ST         M56
                       17”       20”         10        PB          Dr                        M58
                       18”       22”         10        PB          Dr        G4839G
                        -         -          10         -           P        G4842           M60
                        -         -          10         -        Bevel       G4842ST
                        -         -          12         -           P        G4842C
 2’-11¼”     3’-6”     15”       18”         10        IL       M. Wardle    G4842IW
                       17”       20”         10        IL          Dr        G4842E
                       17”       20”         10        PB          Dr                        S62
                       15”       18”         12        IL       Dr Bevel     G4842DD
     Diameter           Crank Throw   Spokes      Crank      Type                  References
S Scale      4mm    S Scale     4mm                Pin
                      -         -       Disc        -           P                          S64
                      -         -       Disc        -       Bullied       G4842B           M66
                      -         -         8         -           P                          M68
                      -         -         9         -           P         GS836GP
 3’-0”     3’-7”      -         -        10         -           P                          M70
                      -         -        12         -           P                          S72
                     15”       18”       10        IL          Dr                          M74
                     17”       20”       10        PB          Dr                          M76
                     12”       17”       12        IL          Dr                          M78
                      -         -       Disc        -           P         G4844B
                      -         -        10         -           P         G4844            M80
                      -         -        12         -           P         G4844C
 3’-1”     3’-8”      -         -      H spoke      -           P         G4844H
                     20”       24”        8        PB          Dr         G4844A
                     17”       20”        8        IL      Dr T Spoke     G4844E
                     15”       18”       10        IL      M. Wardle      G4844IW
                     13”       16”       10        PB          Dr         G4844I
                     15”       18”       11        PB                     G4844M
                     17”       20”       12        IL                     G4844P
                      -         -       Disc        -           P                          S82
                      -         -        10         -           P                          M84
                      -         -        10         -       P Webb                         L86
                      -         -        10         -           P         GS838
                      -         -        11         -           P                          S88
3’-1¾”     3’-9”      -         -        12         -           P                          S90
                     13”       16”       10        PB          Dr                          S92
                     17”       20”       10        IL          Dr                          S94
                     17”       20”       10        IL      Industrial                      S96
                     13”       16”       12        PB          Dr                          M98
                      -         -       Disc        -           P         G4847S
                      -         -        10         -           P         GS839, G4847
3’-3½      3’-11”     -         -        10         -        Bevel        GS839ST
                      -         -        12         -           P         G4847NW
                     13”       16”       12        IL          Dr         G4847I
                     15”       18”       12        IL          Dr         G4847D
                      -         -       Disc        -           P                          M100
                      -         -        10         -           P                          M102
                      -         -        12         -           P                          L104
                      -         -        12         -        Bevel                         S106
                     17”       20”       10        PB          Dr         G4848
3’-4¼”     4’-0”     18”       22”       10        IL          Dr                          L108
                     13”       16”       12        PB          Dr                          M110
                     17”       20”       12        IL          Dr                          M112
                     18”       22”       12        IL          Dr                          M114
                     18”       22”       13        PB          Dr                          S116
                     17”       20”       15        IL          Dr                          M118
                     18”       22”       15        IL          Dr         G4848G
                      -         -        12         -           P         G4849            L120
                     18”       22”       10        IL          Dr                          L122
 3’-5”     4’-1”     17”       20”     H Sect      IL          Dr                          EL124
                     18”       22”       12        IL          Dr         G4849N           M126
                     16”       19”       12        PB          Dr         G4849B
                     20”       24”    12 H Sect    PB          Dr         G4849G
 3’-6”     4’-2”      -         -       Disc        -           P         G4850            S128
                      -         -        10         -           P         GS842            S129
                      -         -        10         -           P         G4851C           M130
                      -         -        12         -           P         G4851            S132
                      -         -        12         -        Bevel        G4851ST          M134
3’-6¾”     4’-3”     20”       24”       12        IL          Dr                          M136
                     20”       24”       12        PB          Dr                          S138
                     18”       22”       13        PB          Dr         G4851S           S142
                     22”       26”       14        PB     Min of Supply   G4851N           L144
                     20”       24”     H Sect      PB        Webb                          M140
 3’-8”                -         -        10         -           P         GS844
     Diameter           Crank Throw   Spokes      Crank    Type               References
S Scale      4mm    S Scale     4mm                Pin
                      -         -        14         -        P       G4854            M148
                      -         -        14         -      Bevel     G4854D           S150
                     17”       20”       10        IL       Pug                       M152
                     20”       24”       11        IL      USA       G4854S           ES154
                     20”       24”    12 H Sect   PB         Dr      G4853            M146
3’-9½”     4’-6”     17”       20”       13       PB         Dr                       L156
                     20”       24”       13       PB         Dr                       M158
                     16”       19”       14       PB         Dr      G4854W
                     17”       20”       14        IL        Dr                       M160
                     17”       20”       14       PB         Dr                       S162
                     20”       24”       14        IL        Dr                       L164
                     20”       24”       15        IL        Dr                       S166
                      -         -        13         -        P                        M168
                      -         -        14         -        P                        M170
                     17”       20”       14        IL        Dr                       M172
                     17”       20”       14       PB         Dr                       S174
                     18”       22”       14        IL        Dr      G4855E
                     20”       24”       14        IL        Dr                       L176
3’-10¼”    4’-7”     20”       24”       14       PB         Dr      G4855J           S178
                     22”       26”       14        IL        Dr      G4855N
                     22”       26”       14       PB         Dr      G4855L
                     25”       30”       14        IL        Dr                       L180
                     20”       24”       15        IL        Dr      G4855            S182
                     23”       28”       15       PB      Dr Bevel   G4855S
                     17”       20”       16       PB         Dr                       S184
                      -         -        14         -        P       G4856
                     23”       28”      Disc      N/A       WD       G4855D           ES186
                     16”       19”       14       PB         Dr      G4855W
                     23”       28”       14       PB         Dr                       S188
                     25”       30”       14        IL        Dr      G4855G
3’-11”     4’-8”     23”       28”       15        IL        Dr                       S190
                     23”       28”       15       PB      Dr Bevel                    M192
                     22”       26”       16       PB         Dr                       S194
 4’-0”     4’-9”     20”       24”       13       PB         Dr                       S196
                     18”       22”       14       PB         Dr                       M198
4’-0½”     4’-10”    18”       22”       15        IL        Dr                       S200
                     18”       22”       16        IL        Dr      G4858            M202
                      -         -        16         -        P                        S204
                     17”       20”       15        IL        Dr                       M206
                     20”       24”       15       PB         Dr                       M208
                     20”       24”       15       PB      Dr Bevel   G4860
4’-2½”     5’-0”     23”       28”       15       PB      Dr Bevel                    M210
                     15”       18”       16        IL        Dr                       M212
                     18”       22”       16        IL        Dr      G4860E
                     20”       24”       16        IL        Dr                       S214
                     20”       24”       16       PB         Dr                       M216
                      -         -        12         -        P       GS851
                      -         -        12         -      Bevel     GS851ST
4’-3¾”     5’-1”      -         -        16         -        P                        S218
                     20”       24”     Bullied    N/A        Dr      G4860B           M220
                     20”       24”       16        IL        Dr                       M222
                      -         -        16         -        P                        S224
                     20”       24”       15       PB         Dr                       L226
                     18”       22”       16        IL        Dr      G4862
                     18”       22”       16       PB         Dr      G4862E
 4’-4”     5’-2”     18”       22”       16        IL     Dr Bevel   G4862ST
                     17”       20”       16        IL        Dr                       L228
                     17”       20”       16       PB         Dr                       M230
                     20”       24”       16        IL        Dr                       S232
                     20”       24”       16       PB         Dr                       S234
                      -         -        16         -        P                        S236
                     20”       24”       15       PB         Dr                       S238
 4’-5”     5’-3”     20”       24”       16        IL        Dr                       M240
                     22”       26”       16       PB      Dr Bevel                    M242
     Diameter          Crank Throw   Spokes    Crank      Type                 References
S Scale      4mm   S Scale     4mm              Pin
                    24”                15       IL      Dr Bevel      GS855S
                    24”                15       IL          Dr        GS855
                    18”       22”      16       IL          Dr                         M244
                    20”       24”      16       IL          Dr                         S246
                    20”       24”      16      PB           Dr                         L248
                    18”       22”      17      PB           Dr        G4866M
                    22”       26”      17       IL          Dr        G4866C           M250
4’-7½”     5’-6”    22”       26”      17      PB       Dr Bevel      G4866ST          M252
                    15”       18”      18       IL          Dr        G4867
                    23”       28”      18      PB       Dr Bevel      G4866S
                    19”       23”      18      PB           Dr        G4866
                    15”       20”      18       IL          Dr                         M254
                    18”       22”      18       IL          Dr                         M256
                    18”       22”      18      PB           Dr                         M258
                    25”       30”      18      PB      Dr Post 1930                    M260
4’-8¼”     5’-7”    15”       18”      18       IL          Dr                         S262
                     -         -       18        -          P         G4869            L264
                    20”       24”      16       IL          Dr        G4868G           S266
                    18”       22”      17      PB           Dr                         M268
                    17”       20”      18      PB           Dr                         S270
 4’-9”     5’-8”    20”       24”      18       IL          Dr                         M272
                    22”       26”      18      PB           Dr        G4868L
                    22”       26”      18      PB           Dr                         M274
                    22”       26”      18      PB       Dr Bevel      G4868ST
                    23”       28”      18      PB       Dr Bevel                       M276
                    25”       30”      18       IL     Dr Pre 1930                     M278
                    25”       30”      18      PB      Dr Post 1930   G4868            M280
                    17”       20”      20       IL          Dr        G4868C
                    22”       26”      20       IL          Dr                         M282
4’-10”     5’-9”    22”                16       IL          Dr        GS858
                    15”       18”      20       IL          Dr                         M284
                    15”       18”      19      PB           Dr                         L286
                    23”       28”      19      PB           Dr        G4873            M288
                    23”       28”      19      PB       Dr Bevel      G4872            L290
                    23”       28”      20       IL      Dr Bevel      G4872S
5’-0½”     6’-0”    17”       20”      20       IL          Dr                         M292
                    22”       26”      20       IL          Dr                         L294
                    22”       26”      20      PB           Dr                         S296
                    25”       30”      20       IL     Dr Pre 1930                     EL298
                    25”       30”      20      PB      Dr Post 1930   G4872W           L300
                     -         -       20        -          P         G4874G           S302
                    22”       26”    Bullied   N/A          Dr        G4874B           L304
                    22”                16       IL          Dr        GS862
5’-2¼”     6’-2”    22”       26”      18      PB           Dr        G4874V           M306
                    20”       24”      19      PB           Dr        G4874H
                    22”       26”      20       IL          Dr                         S308
                    22”       26”      20      PB           Dr        G4874L           M310
                    22”       26”      20      PB       Dr Bevel                       S312
                    23”       28”      20       IL      Dr Bevel      G4874
                    25”       30”      21      PB           Dr        G4874W
                    20”       24”      19      PB           Dr                         M314
 5’-3”     6’-3”    20”       24”      20       IL          Dr                         M315
                    25”       30”      21      PB           Dr                         L316
                     -         -       22        -          P                          M318
                    18”       22”      20       IL          Dr        G4878M           M320
                    20”       24”      20      PB           Dr        G4878E
                    22”       26”      20      PB           Dr                         M322
5’-5½”     6’-6”    23”       28”      20      PB       Dr Bevel                       M324
                    15”       18”      22       IL          Dr        G4878            M326
                    22”       26”      22       IL          Dr                         M328
                    23”       28”      22      PB           Dr          G4878W?         S330
                    23”       28”      22       IL      Dr Bevel      G4878S
     Diameter          Crank Throw   Spokes   Crank      Type                 References
S Scale      4mm   S Scale     4mm             Pin
                    26”                17      PB      Dr Bevel      GS866ST
                    22”       26”      20      IL          Dr                         M332
                    22”       26”      20      PB          Dr                         S334
5’-6¼”     6’-7”    20”       24”      21      PB          Dr                         S336
                    15”       18”      22      IL          Dr                         M338
                    22”       26”      22      IL          Dr                         M340
                     -         -       22       -          P         G4880G           S342
                    18”       22”      20      PB          Dr                         M344
                    22”       26”      20      PB          Dr        G4880B           M346
                    18”       22”      21      IL          Dr                         M348
5’-7¼”     6’-8”    22”       26”      21      IL          Dr        G4880M
                    22”       26”      21      PB      Dr Bevel      G4881
                    22”       26”      22      IL          Dr                         L350
                    22”       26”      22      PB     Dr Post 1930   G4880            S352
                    18”       22”      22      IL          Dr        G4880S
                    25”       30”      22      IL          Dr                         L354
                    26”                17      PB      Dr Bevel      GS868ST
                    18”       22”      20      IL          Dr                         S356
                    22”       26”      20      IL          Dr                         S358
 5’-8”     6’-9”    22”       26”      20      IL     Dr Large hub                    L360
                    22”       26”      21      IL          Dr                         M362
                    22”       26”      21      PB      Dr Bevel                       L364
                    22”       26”      22      PB          Dr                         M366
                     -         -       20       -          P                          S368
                     -         -       24       -          P                          EL370
5’-10½”    7’-0”    18”       22”      20      PB          Dr                         L372
                    20”       24”      21      PB          Dr        G4884?
                    22”       26”      20      IL          Dr                         M374
                    22”       26”      21      PB          Dr                         M376
                    22”       26”      22      IL          Dr        G4884            M378
                    22”       26”      24      IL          Dr                         EL380
 6’-0”              26”                19      PB      Dr Bevel      GS872
 6’-1”     7’-3”    17”       20”      22      IL          Dr                         M382
6’-3½”     7’-6”     -         -       20       -          P         G4890            M384
                     -         -       24       -          P                          M386
 6’-6”     7’-9”    22”                20      IL          Dr        GS878M
                    22”       26”      22      IL          Dr                         M388
 6’-8”              26”                21      PB      Dr Bevel      GS880
 6’-9”              26”                22      IL          Dr        GS881
                    23”       28”      24      IL          Dr        G4896
 7’-0”              26”                22      IL          Dr        GS884
 The            S                 Scale Model Railway Society
                                           SSMRS DATA SHEET No. 7
                     PROPOSED 3’-0” GAUGE WHEEL AND TRACK STANDARDS




                       Proposed           NMRA Sn3          3mm Society
                       Standard           standards         14.2mm gauge
                       Inches    mm       Inches     mm     Inches     mm
BB    Back to Back     0.508    12.90     0.480     12.19   0.504    12.80
CC    Check            0.526    13.35     0.513     13.03   0.522    13.30
      Clearance
TW    Tyre Width       0.067    1.70      0.110    2.79     0.067    1.70
T     Tread Width      0.049    1.25      0.080    2.03     0.049    1.25
FD    Flange Depth     0.024    0.60      0.028    0.71     0.024    0.60
F     Flange Width     0.018    0.45      0.030    0.76     0.018    0.45

TG    Track Gauge      0.563    14.29     0.563    14.29    0.559    14.20
FW    Crossing         0.031    0.79      0.053    1.34     0.032    0.80
      Flangeway
CG    Check Gauge      0.532    13.50     0.513    13.04    0.528    13.40
Notes
1.       CC on both 3mm society and Draft proposal estimated from other
dimensions.
2.       No Tolerances calculated for draft proposals yet.

                                                                             Sources:
                                                                             NMRA Sn3 Dimensions from “Sn3 modelling”
                                                                             Donald J Heimburger 1982
                                                                             NMRARP25 Dimensions Model Railroader
                                                                             Nov 1967
                                                                             3mm Scale Dimensions “14.2 Explained” 3mm
                                                                             society publication
 The         S             Scale Model Railway Society
                       SSMRS DATA SHEET No. 8 - TRACK GAUGES

At present the S Scale MRS does not produce gauges for track construction. It is possible to make
use of vernier callipers to set the track gauge, but the ideal arrangement is to use purpose-designed
gauges, although it is necessary for these to be made by the member.

To undertake the construction of plain track and pointwork two types of gauge are required: a track
gauge and a check rail gauge. Our track standards (see SSMRS Data Sheet No. 3) incorporate
progressive gauge widening on curves, and thus four sets of gauges are needed to permit the
construction of straight and curved track. There are several methods of making suitable gauges, and
two of these are set out below.

The first method involves sets of gauges being made to the following pattern by milling from silver
steel, but they can also be made of standard stock bolted and then soldered together. Pieces of shim
may be needed for final adjustment of dimensions - the only critical one is the gauge measurement
itself.



                    TRACK                                           FLANGEWAY




* These dimensions increased by 0.004” increments for Nos 2, 3 and 4 sets.
  Material Ground Flat stock (un-hardened)

                  TRACK GAUGE                   FLANGEWAY                        USED ON
  Set No.   PROTOTYPE     S GAUGE          PROTOTYPE   S GAUGE          PROTOTYPE        S GAUGE
     1        4’-8½”        0.884”            1¾”        0.028”          STRAIGHT       STRAIGHT
     2        4’-8¾”        0.888”             2”        0.032”        10-7 CH. RAD.   10’-3” – 7’-2”
     3         4’-9”        0.892”            2¼”        0.036”        7-5½ CH RAD.     7’-2” – 5’-8”
     4        4’-9¼”        0.896”            2½”        0.040”        UNDER 5½ CH     UNDER 5’-8”
The other method uses 6BA studding and tapped pillars - items which are readily available from
suppliers of electronic equipment and components (try Tandy, Maplin etc.) as they are used to hold
PC hoards apart in electronic assemblies. Also needed is some metal (brass, nickel silver, steel,
aluminium, etc) of the same thickness as the railhead in use.

From the metal prepare the 'cheeks'. Dimensions ate not critical, but a suitable size is 3/8  3/16in,
and they should be centrally drilled No. 34 to clear 6BA. The 'spacers' should be 3/16in wide, with
the other dimension being 3/8in less twice the rail height being used, also drilled centrally No. 34. A
tapped pillar should be sawn in half - they are turnings so the ends will be square.

Take a piece of 6BA studding, and thread on a piece of the pillar towards one end. The rough sawn
end should be towards the centre, and the joint between this and the studding should be sealed with
Araldite. When dry, place a cheek at the outer (square) end and secure firmly with a 6BA nut before
sealing the joint between the cheek and the pillar with Araldite. After this has cured, run the other
piece of pillar onto the opposite end of the studding, followed by another cheek and 6BA nut. The
position of this second piece of tapped pillar is adjusted until the distance over the outer faces of the
two cheeks is the desired track gauge.

Whilst the measurements need to be established with a micrometer or vernier, the track gauge
dimension is readily adjustable to fine limits. A 6BA thread is equivalent to 47.9TPI, therefore a
complete turn of the pillar represents about 0.020in, with a 0.00lin adjustment being made by a
movement of the pillar through 18°. When the correct position has been established, apply Araldite
to the joint between the cheek and the pillar and also between the two sawn ends of the pillar which
are now in the centre of the gauge. When all joints have set remove the 6BA nuts, add the spacers
and outer cheeks, securing them with the nuts, and finally seal the nuts with Araldite.

The track gauge is then ready for use. The presence of the outer cheeks will hold the rail vertical
during track-making, but if the rail is to be laid with the prototype l in 20 tilt, then the outer cheeks
should be omitted. It is possible to make the gauges with only the pieces of pillar and inner cheeks
secured to the studding, thus allowing interchangeable spacers to be used for differing rail sections,
with the option of outer cheeks or not as desired.

Check rail gauges can be simply made from off-cuts of suitable thickness metal, the standard S-
scale flangeway equivalents being: 0.028in (22SWG), 0.032in (1/32in), 0.036in (20SWG) and
0.040in (lmm).
The            S                Scale Model Railway Society
                                       SSMRS DATA SHEET No. 9
                          5’-3” GAUGE WHEEL AND TRACK STANDARDS




          Radius of Curve           Track gauge           Flangeway
     Prototyp    S Scale        Prototyp    S Scale   Prototyp   S Scale
     e                          e                     e
A    Straight    Straight       5’-3”       0.984”    1.80”      0.028”
B    10-7ch      10’3” – 7’2”   5’-3¼”      0.988”    2.05”      0.032”
C    7-5½ ch     7’2” – 5’8”    5’-3½”      0.992”    2.30”      0.036”
D    <5½ ch      <5’8”          5’-3¾”      0.996”    2.56”      0.040”

                                     Imperial            Metric
BB      Back to Back                 0.938”              23.83mm
CC      Check Clearance              0.956”              24.28mm
TW      Tyre Width                   0.086”               2.18mm
T       Tread Width                  0.068”               1.73mm
FD      Flange Depth                 0.018”              0.46mm
F       Flange Width                 0.018”              0.46mm

TG      Track Gauge                  0.984”              25.00mm
FW      Crossing Flangeway           0.028”               0.71mm
CG      Check Gauge                  0.956”              24.28mm
The      S             Scale Model Railway Society
         SSMRS DATA SHEET No. 10 – THE ALEX JACKSON COUPLING

HOOK DIMENSIONS                    As MMRS (see diagram)

HOOK HEIGHT                        0.535” (13.59mm) above rail head

SUGGESTED WIRE THICKNESS           0.015” (28 SWG, 0.38mm)

UNCOUPLING OPERATION               One hook only to move downwards
The            S                Scale Model Railway Society
                                   SSMRS DATA SHEET No. 11
                          7’-0¼ GAUGE WHEEL AND TRACK STANDARDS




          Radius of Curve           Track gauge           Flangeway
     Prototyp    S Scale        Prototyp    S Scale   Prototyp   S Scale
     e                          e                     e
A    Straight    Straight       7’-0¼”      1.316”    1¾”        0.028”
B    10-7ch      10’3” – 7’2”   7’-0½”      1.320”    2”         0.032”
C    7-5½ ch     7’2” – 5’8”    7’-0¾”      1.324”    2¼”        0.036”
D    <5½ ch      <5’8”          7’-1”       1.328”    2½”        0.040”

                                     Imperial            Metric
BB      Back to Back                 1.27”               32.26mm
CC      Check Clearance              1.288”              32.71mm
TW      Tyre Width                   0.086”               2.18mm
T       Tread Width                  0.068”               1.73mm
FD      Flange Depth                 0.018”               0.46mm
F       Flange Width                 0.018”               0.46mm

TG      Track Gauge                  1.316”              33.43mm
FW      Crossing Flangeway           0.028”               0.71mm
CG      Check Gauge                  1.288”              32.71mm
 The          S             Scale Model Railway Society
                      SSMRS DATA SHEET No. 12 - MASHIMA MOTORS




MH-1220, 1224




MH-1824, 1830, 1833




M-1620, 1624, 1626, 1628, 1630
M-16K




M-19CF




M-20K




M-24F




M-24CF

				
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