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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...
General
| Property | Pennsylvania class K4s streamlined |
|---|---|
| Built | 1936 |
| Manufacturers | Altoona, Baldwin |
| Wheel arrangement | 4-6-2 (Pacific) |
| Gauge | 1,435 mm (Standard gauge) |
Dimensions and weights
| Property | Pennsylvania class K4s streamlined |
|---|---|
| Length | 25.45 m |
| Wheelbase | 11.02 m |
| Rigid wheelbase | 4.22 m |
| Total wheelbase | 26.52 m |
| Service weight | 153.3 t |
| Adhesive weight | 101.2 t |
| Axle load | 33.8 t |
| Total weight | 285.8 t |
| Water capacity | 26,498 l |
| Fuel capacity | 14.5 t (coal) |
Boiler
| Property | Pennsylvania class K4s streamlined |
|---|---|
| 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 K4s streamlined |
|---|---|
| Driver diameter | 2,032 mm |
| Boiler pressure | 14.1 bar |
| Expansion type | simple expansion |
| Cylinders | two, 686 x 711 mm |
Power
| Property | Pennsylvania class K4s streamlined |
|---|---|
| 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 K4s streamlined |
|---|---|
| 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 |
