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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...
General
| Property | Pennsylvania class S1Remove |
|---|---|
| Built | 1939 |
| Manufacturers | Altoona |
| Wheel arrangement | 6-4-4-6 (Duplex) |
| Gauge | 1,435 mm (Standard gauge) |
Dimensions and weights
| Property | Pennsylvania class S1Remove |
|---|---|
| Length | 42.74 m |
| Wheelbase | 19.61 m |
| Rigid wheelbase | 8.08 m |
| Total wheelbase | 32.80 m |
| Service weight | 275.9 t |
| Adhesive weight | 127.7 t |
| Axle load | 33.6 t |
| Total weight | 480.8 t |
| Water capacity | 91,721 l |
| Fuel capacity | 24 t (coal) |
Boiler
| Property | Pennsylvania class S1Remove |
|---|---|
| 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 S1Remove |
|---|---|
| Driver diameter | 2,134 mm |
| Boiler pressure | 20.7 bar |
| Expansion type | simple expansion |
| Cylinders | four, 559 x 660 mm |
Power
| Property | Pennsylvania class S1Remove |
|---|---|
| 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 S1Remove |
|---|---|
| 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 |
