Indian locomotive class WM

Specifications
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:
• Grate 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

Type and origin
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;

Indian WM
Indian WM
	Vulcan Foundry works photo of EIR no. 2211.
Power type
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;
Configuration:;
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:
• Grate 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
Tractive effort
Performance figures
Tractive effort	19,100 lbf (84.96 kN)
Factor of adh.	5.68
Operators
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.^[2]^[4]^[5] A total of 70 of them were delivered new, and another four were converted from existing class WV engines.^[1]

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.^[1]

Class table

Table of orders and numbers
Year	Manufacturer	Serial Nos.	Qty	First Nos.	All-India Nos.	Notes
1939	Vulcan	4795-4804	10	2210-2214 (EIR) 2300-2304 (GIPR)	13000–13009	Prototypes
1951	Vulcan	6096-6125	30	9001-9030	13010–13039
1953-1954	Robert Stephenson and Hawthorns	7706-7735	30	9301-9369	13040–13069
1939	Vulcan	4787-4790	4	26954-26957	13070–13073	Converted from WV

References

Notes

^ ^a ^b ^c Hughes 1996, p. 23.
^ ^a ^b "Indian Railways 5 ft. 6 in. Gauge 1952 2-6-4T (WM) brochure" (PDF). Vulcan Foundry. Archived from the original (PDF) on 19 October 2013. Retrieved 11 July 2013.
^ "Indian Government Railways Thirty 2-6-4 Type, "WM" Class Side Tank Locomotives 5 ft. 6 in. Gauge". Vulcan Magazine. 2 (4). Vulcan Foundry: 16–17. December 1951. Archived from the original on 30 October 2013. Retrieved 11 July 2013.
^ Hughes 1976, p. 21.
^ Marshall 2009, pp. 88.

Bibliography

Hughes, Hugh (1976). Steam in India. Truro, Cornwall: D. Bradford Barton Ltd. ISBN 0851532586.
Hughes, Hugh (1996). Indian Locomotives: Part 4 – 1941–1990. Harrow, Middlesex: The Continental Railway Circle. ISBN 0-9521655-1-1. OCLC 35135033.
Marshall, Lawrence G (2009). Indian Broad Gauge Steam Remembered. East Harling, Norfolk: Taverner Publications. ISBN 9781901470154.

External links

Media related to Indian locomotive class WM at Wikimedia Commons

[FOOTNOTEHughes199623-1] Hughes 1996, p. 23.

[vulcan-brochure-2] "Indian Railways 5 ft. 6 in. Gauge 1952 2-6-4T (WM) brochure" (PDF). Vulcan Foundry. Archived from the original (PDF) on 19 October 2013. Retrieved 11 July 2013.

[vulcan-magazine-3] "Indian Government Railways Thirty 2-6-4 Type, "WM" Class Side Tank Locomotives 5 ft. 6 in. Gauge". Vulcan Magazine. 2 (4). Vulcan Foundry: 16–17. December 1951. Archived from the original on 30 October 2013. Retrieved 11 July 2013.

[Hughes-SII-21-4] Hughes 1976, p. 21.

[Marshall-IBGSR-88-5] Marshall 2009, pp. 88.

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