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Pennsylvania class S1
In the search for a very powerful express locomotive to replace the K4 Pacifics, the PRR stumbled upon the problem of the excessive moving masses. The seven feet driving wheels would have resulted in extremely long co...
| Pennsylvania class S1Remove | |
|---|---|
| Variant | Standard |
| Built | 1939 |
| Manufacturers | Altoona |
| Wheel arrangement | 3BB3 du |
| Gauge | 1435 mm |
| Length | 42736 mm |
| Service mass | 275862 kg |
| Top speed | 193 km/h |
| Power | |
| Engine |
General
| Property | Pennsylvania class S1 Standard Remove |
|---|---|
| Built | 1939 |
| Manufacturers | Altoona |
| Wheel arrangement | 6-4-4-6 (Duplex) |
| Gauge | 1,435 mm |
Dimensions and weights
| Property | Pennsylvania class S1 Standard Remove |
|---|---|
| Length | 42.74 m |
| Wheelbase | 19.61 m |
| Total wheelbase | 32.80 m |
| Service mass | 275.9 t |
| Adhesion mass | 127.7 t |
| Total mass | 480.8 t |
| Rigid wheelbase | 8.08 m |
| Axle load | 33.6 t |
| Water capacity | 91,721 l |
| Fuel capacity | 24 t (coal) |
Boiler
| Property | Pennsylvania class S1 Standard Remove |
|---|---|
| Grate area | 12.263 m² |
| Firebox surface | 61.316 m² |
| Tube heating surface | 464.609 m² |
| Evaporative heating surface | 525.925 m² |
| Superheater surface | 193.703 m² |
| Total heating surface | 719.6 m² |
Power plant
| Property | Pennsylvania class S1 Standard Remove |
|---|---|
| Driver diameter | 2,134 mm |
| Boiler pressure | 20.7 bar |
| Expansion type | simple expansion |
| Cylinders | four, 559 x 660 mm |
Power
| Property | Pennsylvania class S1 Standard Remove |
|---|---|
| Power source | steam |
| Indicated power | 5,369 kW (7,300 PS) |
| Top speed | 193 km/h |
| Starting effort | 339.9 kN |
Calculated values
| Property | Pennsylvania class S1 Standard Remove |
|---|---|
| Factor of adhesion | 1 : 3.68 |
| Optimal speed | 97 km/h |
| Power-to-weight ratio | 19.5 kW/t |
| Heating Surface Equivalent | 1,219.9 m² |
| Cylinder volume/HSE | 1 : 531.06 |
| Adhesive weight/Total | 1 : 2.16 |
| Tractive force/Heating surface | 1 : 9.86 |
| Grate area/Heating surface | 1 : 58.68 |
| Firebox/Tube surface | 1 : 7.58 |
| Total/Superheater | 1 : 2.72 |
