Indian locomotive class WM

Indian WM
Vulcan Foundry works photo of EIR no. 2211.
Type and origin Power type Steam Builder Vulcan Foundry (40 (+4 ex WV)) Robert Stephenson and Hawthorns (30) Build date 1939, 1951, 1953, 1954 Total produced 70 new 4 ex WV
Specifications Configuration: ​  • Whyte 2-6-4T  • UIC 1′C2′h2t Gauge 5 ft 6 in (1,676 mm) Driver dia. 5 ft 7 in (1,702 mm) Axle load 16.25 long tons (16.51 t; 18.20 short tons) Loco weight 96.6 long tons (98.2 t; 108.2 short tons) Fuel type Coal Fuel capacity 6.5 long tons (6.6 t; 7.3 short tons) Water cap 3,000 imp gal (14,000 L; 3,600 US gal) Firebox:  • Firegrate area 24.6 sq ft (2.29 m2) Boiler pressure 210 psi (1.45 MPa) Heating surface 965 sq ft (89.7 m2) Superheater: ​  • Type AX pattern (21 A-type elements)  • Heating area 230 sq ft (21 m2) Cylinders Two, outside Cylinder size 16 in × 28 in (406 mm × 711 mm) Valve gear Walschaerts
Performance figures Tractive effort 19,100 lbf (84.96 kN) Factor of adh. 5.68
Career Operators Indian Railways Number in class 70 + 4 Numbers 13000–13073

The Indian locomotive class WM was a class of 2-6-4T tank locomotives used on 5 ft 6 in (1,676 mm) broad gauge lines in India from 1942. A total of 70 of them were delivered new, and another four were converted from existing class WV engines.

The ten prototypes of the WM class, the first 30 production units, and the four WV class locomotives that were later converted to WMs, were built by Vulcan Foundry in Newton-le-Willows, Lancashire, England. The remaining 30 WM class engines were built by Robert Stephenson and Hawthorns in North East England.

See also

• History of rail transport in India
• Indian Railways
• Locomotives of India
• Rail transport in India