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Southern Pacific classes SP-1 to SP-3
To haul heavy freight and passenger trains over the Sierra Nevada, the Southern Pacific ordered large locomotives for mixed service from ALCO Schenectady in 1925. They were the first locomotives in the USA with the 4-...
| Southern Pacific classes SP-1 to SP-3Remove | |
|---|---|
| Variant | Standard |
| Built | 1925-1927 |
| Manufacturers | ALCO |
| Wheel arrangement | 2E1 |
| Gauge | 1435 mm |
| Length | |
| Service mass | 201849 kg |
| Top speed | 113 km/h |
| Power | |
| Engine |
General
| Property | Southern Pacific classes SP-1 to SP-3 Standard Remove |
|---|---|
| Built | 1925-1927 |
| Manufacturers | ALCO |
| Wheel arrangement | 4-10-2 (Reid Tenwheeler) |
| Gauge | 1,435 mm |
Dimensions and weights
| Property | Southern Pacific classes SP-1 to SP-3 Standard Remove |
|---|---|
| Wheelbase | 13.79 m |
| Total wheelbase | 26.90 m |
| Service mass | 201.8 t |
| Adhesion mass | 143.3 t |
| Total mass | 334.6 t |
| Rigid wheelbase | 6.96 m |
| Axle load | 28.7 t |
| Water capacity | 45,993 l |
| Fuel capacity | 2.2 t (oil) |
Boiler
| Property | Southern Pacific classes SP-1 to SP-3 Standard Remove |
|---|---|
| Grate area | 8.324 m² |
| Firebox surface | 36.232 m² |
| Tube heating surface | 491.086 m² |
| Evaporative heating surface | 527.318 m² |
| Superheater surface | 139.355 m² |
| Total heating surface | 666.7 m² |
Power plant
| Property | Southern Pacific classes SP-1 to SP-3 Standard Remove |
|---|---|
| Driver diameter | 1,600 mm |
| Boiler pressure | 15.5 bar |
| Expansion type | simple expansion |
| Cylinders | three, 635 x 711 mm |
Power
| Property | Southern Pacific classes SP-1 to SP-3 Standard Remove |
|---|---|
| Power source | steam |
| Estimated power | 2,983 kW (4,056 PS) |
| Top speed | 113 km/h |
| Starting effort | 388.2 kN |
| Starting effort booster | 54.936 kN |
Calculated values
| Property | Southern Pacific classes SP-1 to SP-3 Standard Remove |
|---|---|
| Factor of adhesion | 1 : 3.62 |
| Optimal speed | 51 km/h |
| Power-to-weight ratio | 14.8 kW/t |
| Heating Surface Equivalent | 987.2 m² |
| Cylinder volume/HSE | 1 : 684.46 |
| Adhesive weight/Total | 1 : 1.41 |
| Tractive force/Heating surface | 1 : 12.16 |
| Grate area/Heating surface | 1 : 80.09 |
| Firebox/Tube surface | 1 : 13.55 |
| Total/Superheater | 1 : 3.78 |
