Various 5” Gauge “Standards”
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Nominal Track Gauge 5" |
Tolerances |
SMEE |
Baker |
Baker (N) |
Derby |
Evans |
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Given dimensions for track |
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Track Gauge * |
minimum |
G = 5.00 |
5.00 |
5.00 |
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5.000 |
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Track Gauge * |
maximum |
n/s |
5.09 |
5.09 |
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n/s |
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Track back to back * |
maximum |
4.620 |
4.62 |
4.62 |
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4.620 |
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Rail head radius |
n/c |
n/s |
0.07 |
0.07 |
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n/s |
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Rail Head Width (Nominal) |
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0.50 |
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Given dimensions for wheel sets |
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Check Gauge |
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+/- 0.010" |
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4.79 |
4.79 |
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Root radius |
n/c |
0.070 |
0.07 |
0.07 |
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0.070 |
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Flange thickness |
n/c |
0.106 |
0.11 |
0.14 |
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0.106 |
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Flange tip radius *** |
n/c |
0.045 |
0.05 |
0.06 |
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0.045 |
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Wheel ( tyre ) width * |
minimum |
0.535 |
0.54 |
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0.535 |
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n/c |
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0.75 |
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Wheel edge chamfer height |
n/c |
0.030 |
0.03 |
0.04 |
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0.030 |
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Chamfer angle ( degrees ) |
n/c |
45.000 |
45 |
45 |
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45.000 |
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Flange angle ( degrees ) ** |
n/c |
20.000 |
20 |
20 |
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20.000 |
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Coning angle ( degrees ) ** |
n/c |
2.000 |
2 |
2 |
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2.000 |
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Computed dimensions for wheel sets |
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Diameter Point Width |
n/c |
n/s |
0.17 |
0.21 |
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n/s |
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Wheel set Gauge |
n/c |
n/s |
4.89 |
4.91 |
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n/s |
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Wheel set back to back * |
n/c |
4.687 |
4.69 |
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4.656 |
4.687 |
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minimum |
n/s |
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4.63 |
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n/s |
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Flange depth |
n/c |
0.140 |
0.13 |
0.18 |
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0.140 |