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British Rail standard class 9F
The class 9F goods locomotive was built from 1954 as the last and most powerful of the standard steam locomotives from British Railways. This was ordered when extensive electrification of the British railway network w...
General
| Property | British Rail standard class 9F with tender BR1G |
|---|---|
| Built | 1954-1960 |
| Manufacturers | Crewe, Swindon |
| Wheel arrangement | 2-10-0 (Decapod) |
| Gauge | 1,435 mm (Standard gauge) |
Dimensions and weights
| Property | British Rail standard class 9F with tender BR1G |
|---|---|
| Length | 20.17 m |
| Wheelbase | 9.20 m |
| Rigid wheelbase | 6.60 m |
| Service weight | 88.1 t |
| Adhesive weight | 78.7 t |
| Axle load | 15.7 t |
| Total weight | 141.4 t |
| Water capacity | 22,731 l |
| Fuel capacity | 7.1 t (coal) |
Boiler
| Property | British Rail standard class 9F with tender BR1G |
|---|---|
| Grate area | 3.735 m² |
| Firebox surface | 16.63 m² |
| Tube heating surface | 170.57 m² |
| Evaporative heating surface | 187.2 m² |
| Superheater surface | 49.72 m² |
| Total heating surface | 236.9 m² |
Power plant
| Property | British Rail standard class 9F with tender BR1G |
|---|---|
| Driver diameter | 1,524 mm |
| Boiler pressure | 17.2 bar |
| Expansion type | simple expansion |
| Cylinders | two, 508 x 711 mm |
Power
| Property | British Rail standard class 9F with tender BR1G |
|---|---|
| Power source | steam |
| Estimated power | 1,491 kW (2,027 PS) |
| Starting effort | 176.4 kN |
Calculated values
| Property | British Rail standard class 9F with tender BR1G |
|---|---|
| Factor of adhesion | 1 : 4.38 |
| Optimal speed | 51 km/h |
| Power-to-weight ratio | 16.9 kW/t |
| Heating Surface Equivalent | 369.8 m² |
| Cylinder volume/HSE | 1 : 779.62 |
| Adhesive weight/Total | 1 : 1.12 |
| Tractive force/Heating surface | 1 : 15.55 |
| Grate area/Heating surface | 1 : 63.43 |
| Firebox/Tube surface | 1 : 10.26 |
| Total/Superheater | 1 : 3.77 |
