The Indian locomotive class XS was a class of experimental four-cylinder "Pacific" type steam locomotives used on broad-gauge lines in British India, and then in post-partition Pakistan.
The four members of the class were built by Vulcan Foundry in Newton-le-Willows, Lancashire, England, in 1930. They were divided into two sub-classes, XS1 and XS2, each made up of two locomotives. Upon the partition of India in 1947, they all went to Pakistan.
See also
History of rail transport in Pakistan Indian Railways Locomotives of India Pakistan Railways
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