Indian locomotive class XP

The Indian locomotive class XP was a class of experimental 4-6-2 "Pacific" type steam locomotives used on broad gauge lines in India.[1][2][3]

Indian XP
Vulcan Foundry works photo of GIPR no. 3100.
Type and origin
Power typeSteam
BuilderVulcan Foundry
Serial number4694–4695
Build date1937
Total produced2
Specifications
Configuration:
​
 • Whyte4-6-2
 • UIC2′C1′h4
Gauge5 ft 6 in (1,676 mm)
Driver dia.6 ft 2 in (1.880 m)
Axle load18 2⁄3 long tons (19.0 t; 20.9 short tons)
Adhesive weight55.75 long tons (56.64 t; 62.44 short tons)
Loco weight99 long tons (101 t; 111 short tons)
Tender weight74 long tons (75 t; 83 short tons)
Fuel typeCoal
Fuel capacity13 long tons (13 t; 15 short tons)
Water cap5,500 imp gal (25,000 l; 6,600 US gal)
Firebox:
 • Firegrate area		40 sq ft (3.7 m2)
Boiler pressure210 psi (1.45 MPa)
CylindersTwo, outside
Cylinder size21 1⁄2 in × 28 in (546 mm × 711 mm)
Valve gearCaprotti
Performance figures
Tractive effort33,055 lbf (147.04 kN)
Career
Operators
Number in class2
Numbers
  • GIPR: 3100, 3101
  • IR: 22599, 22600
DispositionBoth scrapped
[1][2][3][4][5]

The two members of the class were built by Vulcan Foundry in Newton-le-Willows, Lancashire, England, to an order placed by the Great Indian Peninsula Railway (GIPR) in 1935.[2]

Background

The class XP was intended to have the power of the class XC heavy passenger Pacific locomotives, but the operating area of the light axle load class XB Pacifics.[4]

The performance objectives set for the class XP were running mileages of 200,000 mi (320,000 km) between overhauls, and a monthly average mileage of 10,000 mi (16,000 km). Both of these objectives were very ambitious for the time.[4]

Design details

The basis for the class XP design was the boiler and firebox of the XB, with some modification to their details. The wheels and cylinders of the two classes had the same dimensions.[4]

The XP's boiler pressure was higher, and its tractive effort was greater, than those of both the XB and the XC.[4]

Both class XP locomotives were fitted with Caprotti valve gear, and roller bearings on all engine and tender wheels. The class leader's bearings were supplied by Timken, and its class mate's bearings were by Skefco.[4]

In 1946, when the Indian government ordered the 16 class WP prototypes, their design was based on that of the class XP.[4][6]

Service history

The class XP locomotives entered service with the GIPR in 1937, as nos. 3100 and 3101.[2][4]

The class leader was named King George, in honour of the then King-Emperor of India, and the other class XP engine was named Queen Elizabeth, after the then Queen-Empress.[1]

In November 1951, the GIPR was incorporated into the Central Railway zone of the Indian Railways. In the All-India renumbering of 1957, the two class XP locomotives were given the numbers 22599 and 22600, respectively.[2][4]

Both locomotives had been withdrawn from service by 1970.[3]

See also

References

Notes
  1. Hughes 1990, p. 59.
  2. Hughes 1996, p. 24.
  3. Marshall 2009, p. 36.
  4. "Steam Locomotive Classes: XP". IRFCA website. IRFCA. Retrieved 16 July 2013. External link in |work= (help)
  5. "Annotated works photo". Vulcan Foundry. Archived from the original (JPG) on 17 July 2013. Retrieved 17 July 2013.
  6. Hughes 1996, p. 12.

Bibliography
  • Hughes, Hugh (1990). Indian Locomotives: Part 1 – Broad Gauge 1851–1940. Harrow, Middlesex: The Continental Railway Circle. ISBN 0-9503469-8-5.
  • Hughes, Hugh (1996). Indian Locomotives: Part 4 – 1941–1990. Harrow, Middlesex: The Continental Railway Circle. ISBN 0-9521655-1-1.
  • Marshall, Lawrence G (2009). Indian Broad Gauge Steam Remembered. East Harling, Norfolk: Taverner Publications. ISBN 9781901470154.

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