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US Railroad Administration Light Mikado
Since the 2-8-2 wheel arrangement had now become the US standard for lighter freight trains, the USRA designed the Light Mikado as the standard type for this purpose. It is considered the first USRA design to enter se...
General
| Property | US Railroad Administration Light MikadoRemove |
|---|---|
| Built | 1918-1922 |
| Manufacturers | ALCO, Baldwin, Lima |
| Wheel arrangement | 2-8-2 (Mikado) |
| Gauge | 1,435 mm (Standard gauge) |
Dimensions and weights
| Property | US Railroad Administration Light MikadoRemove |
|---|---|
| Wheelbase | 11.00 m |
| Rigid wheelbase | 5.11 m |
| Total wheelbase | 21.74 m |
| Service weight | 131.9 t |
| Adhesive weight | 100.5 t |
| Total weight | 217.3 t |
| Water capacity | 37,854 l |
| Fuel capacity | 14.5 t (coal) |
Boiler
| Property | US Railroad Administration Light MikadoRemove |
|---|---|
| Grate area | 6.197 m² |
| Firebox surface | 26.013 m² |
| Tube heating surface | 325.44 m² |
| Evaporative heating surface | 351.453 m² |
| Superheater surface | 81.941 m² |
| Total heating surface | 433.4 m² |
Power plant
| Property | US Railroad Administration Light MikadoRemove |
|---|---|
| Driver diameter | 1,600 mm |
| Boiler pressure | 13.8 bar |
| Expansion type | simple expansion |
| Cylinders | two, 660 x 762 mm |
Power
| Property | US Railroad Administration Light MikadoRemove |
|---|---|
| Power source | steam |
| Estimated power | 2,200 kW (2,991 PS) |
| Starting effort | 243.4 kN |
Calculated values
| Property | US Railroad Administration Light MikadoRemove |
|---|---|
| Factor of adhesion | 1 : 4.05 |
| Optimal speed | 55 km/h |
| Power-to-weight ratio | 16.7 kW/t |
| Heating Surface Equivalent | 645.4 m² |
| Cylinder volume/HSE | 1 : 808.84 |
| Adhesive weight/Total | 1 : 1.31 |
| Tractive force/Heating surface | 1 : 11.73 |
| Grate area/Heating surface | 1 : 69.94 |
| Firebox/Tube surface | 1 : 12.51 |
| Total/Superheater | 1 : 4.29 |
