Baldwin Class 10-12-D
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The Baldwin Class 10-12-D was a class of narrow gauge 4-6-0 pannier tank steam locomotives built by the Baldwin Locomotive Works (USA) for the British War Department Light Railways for service in France during World War I. They were built in 1916-1917 to 600 mm (1 ft 111⁄2 in) gauge.
[edit] Dimensions
- Locomotive weight, 14 tons 10 cwt (Note 1)
- Water tank capacity, 476 U.S. gallons
- Coal capacity, 15 cwt (Note 1)
- Boiler pressure, 178 psi (Note 2)
- Superheater, No
- Cylinders, 9"x12"
- Driving wheel diameter, 1' 11½"
- Tractive effort, 6,258 lb
- Valve gear, Walschaert (slide valves)
- Note (1) It is uncertain whether weights are in short tons or long tons
- Note (2) Why is the boiler pressure not 175 or 180 psi? Baldwin had previously built some similar locomotives for the Chemin de fer Militaire de Maroc Occidentale (Military Railways of Western Morocco) and these would have been built to metric dimensions. The figure of 178 pounds per square inch is almost exactly 12.5 Kilograms per square centimetre so this may be the explanation.
For terminology, see Steam locomotive components
[edit] Preservation
Two Baldwin Class 10-12-D locomotives have been preserved in the UK:
- No. 778, Leighton Buzzard Light Railway
- No. 794, Welsh Highland Railway
[edit] Sources
- Light Railways of the First World War by W. J. K. Davies, published by David & Charles, 1967
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