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London & South Western class C8
Great Britain | 1898 | 10 produced
Locomotive Magazine, June 1899

The ten engines of class C8 saw the light of day in 1898 as ordinary 4-4-0 locomotives. They were developed by Dugald Drummond and were initially considered not very successful because they did not achieve sufficient steaming capacity at high speeds due to a firebox that was too small. They could only show better performances after they had received a new boiler.

The new boilers used a patent of WS. Smith of the Midland Railway. They had an elongated firebox pierced by a total of 61 tubes that were exposed to the direct radiation of the fire. This more than doubled the direct heating surface, which significantly increased the output of the boiler.

Despite the increased power, the water-tubed firebox was not considered a success because the extra tubes made maintenance complicated. The fact that these pipes were exposed to very high temperatures meant greater effort. On later locomotives, precautions such as fire bricks or thermosiphons were used instead to increase the heating surface of the firebox. However, the ten locomotives remained in service and were only retired between 1933 and 1938 without having been converted to superheated steam

Variantas builtwater tube firebox
ManufacturerNine Elms
Axle config4-4-0 (American) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Length54 ft 11 in56 ft 5 1/2 in
Wheelbase23 ft 3 in
Fixed wheelbase11 ft
Total wheelbase46 ft 10 in
Service weight104,832 lbs122,192 lbs
Adhesive weight84,448 lbs
Axle load42,336 lbs
Water capacity4,203 us gal
Fuel capacity8,960 lbs (coal)
Power sourcesteam
Estimated power700 hp (522 kW)850 hp (634 kW)
Optimal speed27 mph32 mph
Starting effort16,755 lbf
Power Plant
Driver diameter79 in
Boiler pressure175 psi
Expansion typesimple
Cylinderstwo, 18 1/2 x 26 in
Grate area20.5 sq ft27 sq ft
Firebox area394 sq ft
Tube heating area1,106 sq ft
Evaporative heating area1,500 sq ft
Total heating area1,500 sq ft
Calculated Values
steam locomotive
Dugald Drummond
last changed: 07/2022

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