Indian Railways WCAM Class
WCAM (W -broad gauge ; CA -Both DC and AC ; M -for both goods and passenger service) is the dual-power AC/DC series locomotive used by Indian Railways. These locomotives can run under both DC traction and AC traction. All the WCAM locos were made by BHEL. They have 750V DC traction motors, using resistance banks in DC mode and a variable ratio auto-transformer with rectifier units in AC mode, for power control.
The WCAM class locomotives are in service only in the Mumbai region. The dual-voltage WCAM series locomotives haul intercity trains out of Mumbai DC suburban region which is still on a 1500V DC overhead system, as opposed to other parts of India which have 25000 V AC overhead.
Central Railways section only needs the change-over for the traction, being DC inwards near Mumbai and AC on the outer side.
Western Railways doesn't need WCAM Locos now because Western Railways Mumbai section has been converted to AC Section. On the Central Railway line they are in service on Mumbai - Igatpuri line. Sometimes they travel to Manmad.
Western Railway has converted the Mumbai region's 1500v DC traction to 25000v AC traction. This has result in the elimination of the need to change engine's at Vadodara & WAP engines have started entering the Mumbai region.
Read more about Indian Railways WCAM Class: Types, Specifications
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