Which is the best locomotive in indian railways?

Question

i mean what is full form of wcam and whts difference btwn them

Answer 1

WCAM is the dual-power AC-DC series. Virar is the change-over point the traction, being DC inwards near Bombay and AC on the outer side. The WCAM class of locos on WR have never operated north of Baroda on the mainline and are generallky restricted to BCT-BRC-ADI section. Apart from WR they can be found working on the harbour line of CR in Bombay into the dockyard railway changeover point a Wadala Road. See the electric traction section for more information on AC/DC traction changeover.

All the WCAM locos (and the WCAG-1) 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 (WCAM-1 is slightly different, see below). Except for the WCAM-1, the availability of the variable input voltage allows the traction motors to be coupled in a fixed 2S-3P grouping for AC mode. In DC mode, all three models allow 6S and 3S-2P grouping, and the WCAM-3 also allows 2S-3P.

Most of CR's WCAM-3 locos do not go north of Igatpuri; a few reach all the way to Manmad (Panchavati, Devagiri, Tapovan, and Godavari Expresses) but not beyond, as the maintenance facilities for these locos do not exist beyond there. On WR, WCAM models generally do not venture beyond Vadodara (main-line trains to New Delhi change to purely AC locos there). Trains to Ahmedabad from Mumbai are usually hauled by WCAM locos all the way. Generally the WCAM locos are restricted to Valsad / Surat.