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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 | 1930, 1938 |
| Manufacturers | Baldwin, Milwaukee |
| Wheel arrangement | 4-8-4 (Northern) |
| Gauge | 1,435 mm (Standard gauge) |
Dimensions and weights
| Property | Milwaukee Road classes S1 to S3 Remove |
|---|---|
| Wheelbase | 14.10 m |
| Rigid wheelbase | 6.02 m |
| Total wheelbase | 26.92 m |
| Service weight | 204.5 t |
| Adhesive weight | 117.4 t |
| Axle load | 29.5 t |
| Total weight | 335.7 t |
| Water capacity | 56,781 l |
| Fuel capacity | 18.1 t (coal) |
Boiler
| Property | Milwaukee Road classes S1 to S3 Remove |
|---|---|
| Grate area | 9.569 m² |
| Firebox surface | 51.004 m² |
| Tube heating surface | 450.673 m² |
| Evaporative heating surface | 501.677 m² |
| Superheater surface | 223.246 m² |
| Total heating surface | 724.9 m² |
Power plant
| Property | Milwaukee Road classes S1 to S3 Remove |
|---|---|
| Driver diameter | 1,880 mm |
| Boiler pressure | 15.9 bar |
| Expansion type | simple expansion |
| Cylinders | two, 711 x 762 mm |
Power
| Property | Milwaukee Road classes S1 to S3 Remove |
|---|---|
| Power source | steam |
| Estimated power | 3,468 kW (4,715 PS) |
| Starting effort | 276.4 kN |
Calculated values
| Property | Milwaukee Road classes S1 to S3 Remove |
|---|---|
| Factor of adhesion | 1 : 4.17 |
| Optimal speed | 77 km/h |
| Power-to-weight ratio | 17.0 kW/t |
| Heating Surface Equivalent | 1,203.2 m² |
| Cylinder volume/HSE | 1 : 503.18 |
| Adhesive weight/Total | 1 : 1.74 |
| Tractive force/Heating surface | 1 : 7.96 |
| Grate area/Heating surface | 1 : 75.76 |
| Firebox/Tube surface | 1 : 8.84 |
| Total/Superheater | 1 : 2.25 |
