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The Indian Locomotive Class WAP-4 is a Class of 25 kV AC Electric Locomotives that was developed in 1993 by Chittaranjan Locomotive Works (CLW) for Indian Railways.
They entered service in late 1994. A total of 773 WAP-4 were built at CLW between 1993 and 2015, which made them the most numerous class of mainline Electric Passenger Locomotive until the WAP-7.
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