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Benguela 11[h]th[/h] class
In 1951, North British built six 4-8-2 for the Benguela Railway which were intended for express mail trains along the Atlantic coast and in the inland between Silva Porto and Luau. In most respects they were based on ...
General
| Property | Benguela 11[h]th[/h] classRemove |
|---|---|
| Built | 1951 |
| Manufacturers | North British |
| Wheel arrangement | 4-8-2 (Mountain) |
| Gauge | 1,067 mm (Cape gauge) |
Dimensions and weights
| Property | Benguela 11[h]th[/h] classRemove |
|---|---|
| Wheelbase | 9.83 m |
| Rigid wheelbase | 4.42 m |
| Total wheelbase | 23.37 m |
| Service weight | 80.9 t |
| Adhesive weight | 56.2 t |
| Axle load | 14.2 t |
| Total weight | 155.4 t |
| Water capacity | 22,731 l |
| Fuel capacity | 15.7 t (wood) |
Boiler
| Property | Benguela 11[h]th[/h] classRemove |
|---|---|
| Grate area | 3.345 m² |
| Firebox surface | 12.914 m² |
| Tube heating surface | 157.935 m² |
| Evaporative heating surface | 170.849 m² |
| Superheater surface | 36.232 m² |
| Total heating surface | 207.1 m² |
Power plant
| Property | Benguela 11[h]th[/h] classRemove |
|---|---|
| Driver diameter | 1,372 mm |
| Boiler pressure | 14.1 bar |
| Expansion type | simple expansion |
| Cylinders | two, 533 x 660 mm |
Power
| Property | Benguela 11[h]th[/h] classRemove |
|---|---|
| Power source | steam |
| Estimated power | 895 kW (1,217 PS) |
| Starting effort | 164.6 kN |
Calculated values
| Property | Benguela 11[h]th[/h] classRemove |
|---|---|
| Factor of adhesion | 1 : 3.35 |
| Optimal speed | 34 km/h |
| Power-to-weight ratio | 11.1 kW/t |
| Heating Surface Equivalent | 307.9 m² |
| Cylinder volume/HSE | 1 : 958.62 |
| Adhesive weight/Total | 1 : 1.44 |
| Tractive force/Heating surface | 1 : 16.60 |
| Grate area/Heating surface | 1 : 61.91 |
| Firebox/Tube surface | 1 : 12.23 |
| Total/Superheater | 1 : 4.72 |
