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SSMRS Standard Gauge Wheel and Track Standards
|
Description |
Prototype |
S Scale |
S Coarse |
|
A |
Tyre Width | 5 1/2" |
0.086" |
0.125" |
|
BB |
Back-to-back | 4' -5 5/8" |
0.838" |
0.781" |
|
C |
Tyre Coning | 3° |
3° |
3° |
|
D |
Flange Depth | 1 1/8" |
0.018" |
0.039" |
|
E |
Flange Width | 1 1/8" |
0.018" |
0.039" |
|
F |
Chamfer Depth | 1/4" |
0.004" |
N/A |
|
| Flange/Tread Radius | 5/8" |
0.010" |
0.020" |
It is recommended that rolling stock utilise some form of springing or compensation when using the scale wheel profiles with the 0.018" flanges.
Exact "S" Scale Track Standards |
||||||||
|
Description |
Prototype |
S Scale |
|||||
G |
Gauge |
4'- 81/2" |
0.884" |
|||||
BB |
Back-to-back |
4' -5 3/8" |
0.838" |
|||||
CG |
Check Gauge |
4'- 61/2" |
0.856" |
|||||
FW - Flangeway (Gauge Widening) |
||||||||
Gauge |
Flangeway |
Radius |
||||||
Prototype |
S |
Prototype |
S |
S Scale |
||||
4'-81/2" |
0.884" |
13/4" |
0.028" |
Straight |
||||
4'-83/4" |
0.888" |
2" |
0.032" |
10'3"- 7'2" |
||||
4'-9" |
0.892" |
21/4" |
0.036" |
7'2" - 5'8" |
||||
4'-91/4" |
0.896" |
21/2" |
0.040" |
Under 5'8" |
||||
The dimensions of prototype rail sections are given on a separate page. On the Scalefour society website is a page which reproduces the data from Table 7 in "British Railway Track Bullhead Supplement" (published by The Permanent Way Institution in 1991) for prototype bullhead turnouts from the grouping era companies.
