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The reference for locomotives and railcars

Benguela 11th class

Angola 1951 6 produced
No. 403 on a works photo flickr/Historical Railway Images

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 the South African class 19D and were specified for hauling 500-ton trains on 1.25 percent inclines, while being suited for curve radii of 300 feet. The Benguela usually used eucalyptus wood as fuel, with bars on the tender to increase the capacity. When coal was available, it was used as fuel instead. A Kylchap blast pipe was used to increase power and decrease consumption. Their careers ended in the seventies with the civil war.

No. 404 with a large heap of eucalyptus wood in the tender flickr/Historical Railway Images

Technical data

General

Built
1951
Manufacturers
North British
Wheel arrangement
4-8-2 (Mountain)
Gauge
1,067 mm (Cape gauge)

Dimensions and weights

Wheelbase
9.83 m
Total wheelbase
23.37 m
Service mass
80.9 t
Adhesion mass
56.2 t
Total mass
155.4 t
Rigid wheelbase
4.42 m
Axle load
14.2 t
Water capacity
22,731 l
Fuel capacity
15.7 t (wood)

Boiler

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

Driver diameter
1,372 mm
Boiler pressure
14.1 bar
Expansion type
simple expansion
Cylinders
two, 533 x 660 mm

Power

Power source
steam
Estimated power
895 kW (1,217 PS)
Starting effort
164.6 kN

Calculated values

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
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