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Pennsylvania class K4s
The most important express locomotive of the PRR from 1914 until it was replaced by diesel locomotives. It also survived all of its intended successors. Used the same boiler with Belpaire firebox as the L1s Mikado and...
| Pennsylvania class K4sRemove | |
|---|---|
| Variant | streamlined |
| Built | 1936 |
| Manufacturers | Altoona;Baldwin |
| Wheel arrangement | 2C1 |
| Gauge | 1435 mm |
| Length | 25451 mm |
| Service mass | 153314 kg |
| Top speed | 145 km/h |
| Power | |
| Engine |
General
| Property | Pennsylvania class K4sstreamlined |
|---|---|
| Built | 1936 |
| Manufacturers | Altoona, Baldwin |
| Wheel arrangement | 4-6-2 (Pacific) |
| Gauge | 1,435 mm |
Dimensions and weights
| Property | Pennsylvania class K4sstreamlined |
|---|---|
| Length | 25.45 m |
| Wheelbase | 11.02 m |
| Total wheelbase | 26.52 m |
| Service mass | 153.3 t |
| Adhesion mass | 101.2 t |
| Total mass | 285.8 t |
| Rigid wheelbase | 4.22 m |
| Axle load | 33.8 t |
| Water capacity | 26,498 l |
| Fuel capacity | 14.5 t (coal) |
Boiler
| Property | Pennsylvania class K4sstreamlined |
|---|---|
| Grate area | 6.503 m² |
| Firebox surface | 28.335 m² |
| Tube heating surface | 347.086 m² |
| Evaporative heating surface | 375.422 m² |
| Superheater surface | 87.608 m² |
| Total heating surface | 463.0 m² |
Power plant
| Property | Pennsylvania class K4sstreamlined |
|---|---|
| Driver diameter | 2,032 mm |
| Boiler pressure | 14.1 bar |
| Expansion type | simple expansion |
| Cylinders | two, 686 x 711 mm |
Power
| Property | Pennsylvania class K4sstreamlined |
|---|---|
| Power source | steam |
| Estimated power | 2,431 kW (3,305 PS) |
| Top speed | 145 km/h |
| Starting effort | 197.8 kN |
Calculated values
| Property | Pennsylvania class K4sstreamlined |
|---|---|
| Factor of adhesion | 1 : 5.02 |
| Optimal speed | 76 km/h |
| Power-to-weight ratio | 15.9 kW/t |
| Heating Surface Equivalent | 692.3 m² |
| Cylinder volume/HSE | 1 : 758.94 |
| Adhesive weight/Total | 1 : 1.52 |
| Tractive force/Heating surface | 1 : 8.92 |
| Grate area/Heating surface | 1 : 71.20 |
| Firebox/Tube surface | 1 : 12.25 |
| Total/Superheater | 1 : 4.29 |
