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Great Western Railway class 4200
Great Britain | 1910 | 105 produced
No. 4247 in August 2004 in Toddington
No. 4247 in August 2004 in Toddington
Phil Scott
Locomotive Magazine, February 1911

When the 2-6-0 tank locomotives became too weak on the winding coal lines in South Wales, Churchward constructed a successor. Initially, a 2-8-2 tank locomotive based on the class 2800 was planned, but in the end he left out the trailing axle to negotiate the tight curves and thus developed the first British 2-8-0 tank locomotive. The wheel flanges of the second and third coupled axles were weakened and the fourth coupled axle had lateral play. In tests, the locomotives were said to be able to negotiate curves with a radius of 130 feet without derailing.

General
Built1910-1923
ManufacturerSwindon
Axle config2-8-0T (Consolidation) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Wheelbase28 ft 9 in
Fixed wheelbase20 ft
Service weight182,784 lbs
Adhesive weight162,400 lbs
Axle load41,880 lbs
Water capacity2,162 us gal
Fuel capacity8,960 lbs (coal)
Power
Power sourcesteam
Estimated power900 hp (671 kW)
Optimal speed18 mph
Starting effort31,450 lbf
Power Plant
Driver diameter55.5 in
Boiler pressure200 psi
Expansion typesimple
Cylinderstwo, 18 1/2 x 30 in
Boiler
Grate area20.6 sq ft
Firebox area128.7 sq ft
Tube heating area1,222.3 sq ft
Evaporative heating area1,351 sq ft
Total heating area1,351 sq ft
Calculated Values
steam locomotive
freight
tank locomotive
George Jackson Churchward
last changed: 03/2023
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