Baldwin Class 10-12-D
No. 778, preserved at the Leighton Buzzard Light Railway
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| Type and origin | |
|---|---|
| Power type | Steam |
| Builder | Baldwin Locomotive Works, American Locomotive Company |
| Build date | 1915 |
| Specifications | |
|---|---|
| Configuration: |
|
| • Whyte | 4-6-0PT |
| • UIC | 2′C n2t |
| Gauge | 600 mm (1 ft 11 5⁄8 in) |
| Leading dia. | 1 ft 4 in (0.406 m) |
| Driver dia. | 1 ft 11 1⁄2 in (0.597 m) |
| Wheelbase | Coupled: 5 ft 8 in (1.73 m) |
| Loco weight | 14.5 long tons (14.7 t) (see text) |
| Fuel type | Coal |
| Fuel capacity | 0.75 long tons (0.76 t) (see text) |
| Water cap | 476 US gal (1,800 l; 396 imp gal) |
| Boiler pressure | 178 psi (1.23 MPa) |
| Cylinders | Two, outside |
| Cylinder size | 9 in × 12 in (229 mm × 305 mm) |
| Valve gear | Walschaerts (slide valves) |
| Performance figures | |
|---|---|
| Tractive effort | 6,258 lbf (27.84 kN) |
| Career | |
|---|---|
| Operators | War Department Light Railways, North Western Railway, Welsh Highland Railway, Glyn Valley Tramway, Snailbeach District Railways, Ashover Light Railway |
| Preserved | No. 778 and No. 794 |
| Current owner |
Leighton Buzzard Light Railway (778) Welsh Highland Railway (794) |
| Disposition | 5 known preserved |
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 11 5⁄8 in) gauge.
The French (or actually the Belgians) had designed 600 mm gauge 2′C n2t locomotives as early as in 1900–1901 for Chemins de Fer du Calvados. The prototype was Tubize factory type 73. Weidknecht used these drawings and built similar 11-ton locomotives with subcontracted boilers, presumably built by S.A.Energie, Marcinelle.
The French military circles became interested in this 2′C n2t locomotive type for their Decauville Light Military Railways in Morocco. A little heavier 14-ton type was designed and an order was placed for Weidknecht to produce these locomotives for the 600 mm gauge lines in Morocco.
Weidknecht delivered 10 more in 1913 for Chemins de fer Militaires du Maroc numbered (W1-W5 and 1-5).
When the Great War broke out in August 1914 the French lost most of their locomotive building capacity in the Northern France to German occupied area. Therefore, the French Army demanded fast replacement of the locomotive building capacity for their useful 2′C n2t type which had proved to be a reliable locomotive type for the lightly laid military railways.
Three steam locomotive type drawings were sent to Baldwin Works (finance guaranteed by the French Government) for production of C n2t, 2′C n2t, and light Mallet B′B n4v for 600 mm (1 ft 11 5⁄8 in) gauge lines. With the usual American liberty, Baldwin Drawing Office produced their "version Americaine" of these locomotive types. The first C n2t (based to Decauville design) came out in November 1914 and the first batch of 2′C n2t in January 1915. Only two more batches were built for the French.
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Wikipedia