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Southern Railway (USA) class Ps-4
The Ps-4 was Southern's premier class of Pacifics and also one of the most famous passenger steam locomotives in the United States. It was based on the USRA Heavy Pacific but had some adjustments such as smaller drive...
| Southern Railway (USA) class Ps-4Remove | |
|---|---|
| Variant | 1923 variant |
| Built | 1923-1925 |
| Manufacturers | ALCO;Baldwin |
| Wheel arrangement | 2C1 |
| Gauge | 1435 mm |
| Length | |
| Service mass | 136078 kg |
| Top speed | 129 km/h |
| Power | |
| Engine |
General
| Property | Southern Railway (USA) class Ps-41923 variant |
|---|---|
| Built | 1923-1925 |
| Manufacturers | ALCO, Baldwin |
| Wheel arrangement | 4-6-2 (Pacific) |
| Gauge | 1,435 mm |
Dimensions and weights
| Property | Southern Railway (USA) class Ps-41923 variant |
|---|---|
| Wheelbase | 11.00 m |
| Service mass | 136.1 t |
| Adhesion mass | 81.6 t |
| Total mass | 224.8 t |
| Rigid wheelbase | 3.96 m |
| Axle load | 27.2 t |
| Water capacity | 37,854 l |
| Fuel capacity | 14.5 t (coal) |
Boiler
| Property | Southern Railway (USA) class Ps-41923 variant |
|---|---|
| Grate area | 6.54 m² |
| Firebox surface | 29.172 m² |
| Tube heating surface | 316.358 m² |
| Evaporative heating surface | 345.53 m² |
| Superheater surface | 79.897 m² |
| Total heating surface | 425.4 m² |
Power plant
| Property | Southern Railway (USA) class Ps-41923 variant |
|---|---|
| Driver diameter | 1,854 mm |
| Boiler pressure | 13.8 bar |
| Expansion type | simple expansion |
| Cylinders | two, 686 x 711 mm |
Power
| Property | Southern Railway (USA) class Ps-41923 variant |
|---|---|
| Power source | steam |
| Estimated power | 2,274 kW (3,092 PS) |
| Top speed | 129 km/h |
| Starting effort | 211.4 kN |
Calculated values
| Property | Southern Railway (USA) class Ps-41923 variant |
|---|---|
| Factor of adhesion | 1 : 3.79 |
| Optimal speed | 66 km/h |
| Power-to-weight ratio | 16.7 kW/t |
| Heating Surface Equivalent | 651.2 m² |
| Cylinder volume/HSE | 1 : 806.87 |
| Adhesive weight/Total | 1 : 1.67 |
| Tractive force/Heating surface | 1 : 10.38 |
| Grate area/Heating surface | 1 : 65.05 |
| Firebox/Tube surface | 1 : 10.84 |
| Total/Superheater | 1 : 4.32 |
