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Great Western Railway class 3200 “Earl” / “Dukedog”
Great Britain | 1929 | 30 produced
No. 9017 “Earl of Berkeley” in September 2008
No. 9017 “Earl of Berkeley” in September 2008
Roger Carvell / The 'Earl of Berkeley' leaves Highley for Kidderminster, 2008

After the GWR had taken over the Cambrian Railways, they needed modern locomotives for passenger services on these lines which only allowed a low axle load. Since there were none of these locomotives available, they decided to mount the superheated boiler of Duke class No. 3265 “Tre Pol and Pen” to the intact frames of Bulldog class No. 3365 “Charles Grey Mott” in 1929. This prototype retained the number and name of the Duke.

Because this prototype was successful, 29 further locomotives were built in the same way between 1936 and 1939. They got numbers from 3200 onwards and were officially called “Earl” class. Due to their origin being a mix of the Duke and Bulldog classes, they were also called “Dukedog”. The only one that has been preserved is No. 9017 “Earl of Berkeley”, which hasn't been operational since 2011.

General
Built1929, 1936-1939
ManufacturerSwindon
Axle config4-4-0 (American) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Wheelbase22 ft 3 in
Fixed wheelbase8 ft 6 in
Service weight109,760 lbs
Adhesive weight68,096 lbs
Total weight199,360 lbs
Axle load34,496 lbs
Water capacity4,203 us gal
Fuel capacity13,440 lbs (coal)
Power
Power sourcesteam
Estimated power850 hp (634 kW)
Optimal speed29 mph
Starting effort18,954 lbf
Power Plant
Driver diameter68 in
Boiler pressure180 psi
Expansion typesimple
Cylinderstwo, 18 x 26 in
Boiler
Grate area17.2 sq ft
Firebox area114 sq ft
Tube heating area1,029.1 sq ft
Evaporative heating area1,143 sq ft
Superheater area75 sq ft
Total heating area1,218 sq ft
Calculated Values
steam locomotive
passenger
Charles Benjamin Collett
last changed: 05/2024
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