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Milwaukee Road classes S1 to S3
The history of the 4-8-4 at Milwaukee Road began in 1930 with the single number 9700, which later became the 250, and was supplied by Baldwin. Its power was guaranteed by a boiler with a combustion chamber , thermic s...
General
| Property | Milwaukee Road classes S1 to S3 Remove |
|---|---|
| Built | 1937-1938, 1940 |
| Manufacturers | Baldwin |
| Wheel arrangement | 4-8-4 (Northern) |
| Gauge | 1,435 mm (Standard gauge) |
Dimensions and weights
| Property | Milwaukee Road classes S1 to S3 Remove |
|---|---|
| Wheelbase | 14.43 m |
| Rigid wheelbase | 5.87 m |
| Total wheelbase | 28.05 m |
| Service weight | 222.5 t |
| Adhesive weight | 128.1 t |
| Total weight | 369 t |
| Water capacity | 75,708 l |
| Fuel capacity | 22.7 t (coal) |
Boiler
| Property | Milwaukee Road classes S1 to S3 Remove |
|---|---|
| Grate area | 9.848 m² |
| Firebox surface | 53.698 m² |
| Tube heating surface | 458.105 m² |
| Evaporative heating surface | 511.803 m² |
| Superheater surface | 217.022 m² |
| Total heating surface | 728.8 m² |
Power plant
| Property | Milwaukee Road classes S1 to S3 Remove |
|---|---|
| Driver diameter | 1,880 mm |
| Boiler pressure | 19.7 bar |
| Expansion type | simple expansion |
| Cylinders | two, 660 x 813 mm |
Power
| Property | Milwaukee Road classes S1 to S3 Remove |
|---|---|
| Power source | steam |
| Estimated power | 3,952 kW (5,373 PS) |
| Starting effort | 315.0 kN |
Calculated values
| Property | Milwaukee Road classes S1 to S3 Remove |
|---|---|
| Factor of adhesion | 1 : 3.99 |
| Optimal speed | 77 km/h |
| Power-to-weight ratio | 17.8 kW/t |
| Heating Surface Equivalent | 1,214.3 m² |
| Cylinder volume/HSE | 1 : 458.54 |
| Adhesive weight/Total | 1 : 1.74 |
| Tractive force/Heating surface | 1 : 9.03 |
| Grate area/Heating surface | 1 : 74.01 |
| Firebox/Tube surface | 1 : 8.53 |
| Total/Superheater | 1 : 2.36 |
