The reference for locomotives and railcars
South African class MH
South Africa | 1915 | 5 produced
No. 1661 on a works photo
No. 1661 on a works photo
collection Leith Paxton
ManufacturerNorth British
Axle config2-6-6-2 (Mallet Mogul) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Length79 ft 5 in
Wheelbase43 ft 7 in
Fixed wheelbase8 ft 8 in
Total wheelbase70 ft 10 1/4 in
Service weight287,280 lbs
Adhesive weight236,656 lbs
Total weight402,220 lbs
Axle load40,768 lbs
Water capacity5,104 us gal
Fuel capacity22,400 lbs (coal)
Power sourcesteam
Estimated power1,950 hp (1,454 kW)
Optimal speed26 mph
Starting effort47,252 lbf
with start valve56,702 lbf
Power Plant
Driver diameter48 in
Boiler pressure180 psi
Expansion typecompound
Cylindersfour, HP: 20 x 26 in
and LP: 31 1/2 x 26 in
Grate area53 sq ft
Firebox area250 sq ft
Tube heating area2,961 sq ft
Evaporative heating area3,211 sq ft
Superheater area634 sq ft
Total heating area3,845 sq ft
Calculated Values
steam locomotive
last changed: 08 2023

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