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TheIndian locomotive class XP was a class of experimental4-6-2 "Pacific" typesteam locomotives used on5 ft 6 in (1,676 mm)broad gauge lines in India.[1][2][3]
The two members of the class were built byVulcan Foundry inNewton-le-Willows,Lancashire, England, to an order placed by theGreat Indian Peninsula Railway (GIPR) in 1935.[2]
The class XP was intended to have the power of theclass XC heavy passenger Pacific locomotives, but the operating area of the lightaxle loadclass 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]
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 withCaprotti valve gear, androller bearings on all engine and tender wheels. The class leader's bearings were supplied byTimken, and its class mate's bearings were by Skefco.[4]
In 1946, when the Indian government ordered the 16class WP prototypes, their design was based on that of the class XP.[4][6]
The class XP locomotives entered service with the GIPR in 1937, as nos. 3100 and 3101.[2][4]
The class leader was namedKing George, in honour of the thenKing-Emperor of India, and the other class XP engine was namedQueen Elizabeth, after the then Queen-Empress.[1]
In November 1951, the GIPR was incorporated into theCentral Railway zone of theIndian 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Both locomotives had been withdrawn from service by 1970.[3]
Media related toIndian locomotive class XP at Wikimedia Commons
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