Indian locomotive class WAG-9

The Indian locomotive class WAG-9 is a 25 kV AC electric freight locomotive developed in 1995 by ABB for Indian Railways, entering service in 1996. The name stands for broad gauge, alternating current, goods traffic and ninth generation. It is a heavy haul design with GTO thyristor converters and three-phase asynchronous motors, and its passenger sibling, the WAP-7, uses a different gear ratio. The first 22 units came from ABB, and Chittaranjan Locomotive Works began building it with indigenous components in November 1998, the first, named Navyug, appearing on 14 November 1998. A total of 5,140 have been built at Chittaranjan, with more units built at Banaras Locomotive Works, Bharat Heavy Electricals Limited and Patiala Locomotive Works. Later versions include the WAG-9H and the WAG-9i with IGBT traction control.