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US Railroad Administration Heavy Mikado
In addition to the Light Mikado, the USRA standard designs also included the heavier variant, which basically had the same running gear. However, it received larger cylinders and a significantly heavier boiler. Althou...
General
| Property | US Railroad Administration Heavy 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 Heavy MikadoRemove |
|---|---|
| Wheelbase | 11.00 m |
| Rigid wheelbase | 5.11 m |
| Total wheelbase | 21.86 m |
| Service weight | 147.4 t |
| Adhesive weight | 108.9 t |
| Total weight | 231.5 t |
| Water capacity | 37,854 l |
| Fuel capacity | 14.5 t (coal) |
Boiler
| Property | US Railroad Administration Heavy MikadoRemove |
|---|---|
| Grate area | 6.578 m² |
| Firebox surface | 28.521 m² |
| Tube heating surface | 370.312 m² |
| Evaporative heating surface | 398.833 m² |
| Superheater surface | 92.253 m² |
| Total heating surface | 491.1 m² |
Power plant
| Property | US Railroad Administration Heavy MikadoRemove |
|---|---|
| Driver diameter | 1,600 mm |
| Boiler pressure | 13.1 bar |
| Expansion type | simple expansion |
| Cylinders | two, 686 x 813 mm |
Power
| Property | US Railroad Administration Heavy MikadoRemove |
|---|---|
| Power source | steam |
| Estimated power | 2,349 kW (3,194 PS) |
| Starting effort | 266.0 kN |
Calculated values
| Property | US Railroad Administration Heavy MikadoRemove |
|---|---|
| Factor of adhesion | 1 : 4.01 |
| Optimal speed | 55 km/h |
| Power-to-weight ratio | 15.9 kW/t |
| Heating Surface Equivalent | 725.9 m² |
| Cylinder volume/HSE | 1 : 827.17 |
| Adhesive weight/Total | 1 : 1.35 |
| Tractive force/Heating surface | 1 : 11.31 |
| Grate area/Heating surface | 1 : 74.66 |
| Firebox/Tube surface | 1 : 12.98 |
| Total/Superheater | 1 : 4.32 |
