Railway Electric Traction - Unit Types - Multi-system Units - India

India

In India 1500 V DC and 25 kV AC, 50 Hz, is used for main line trains.

The 1500 V DC overhead system (negative earth, positive catenary) is used around Mumbai. The Mumbai region is the last bastion of 1500 V DC electrified lines on Indian Railways. The Western Railway route from Mumbai Central is now completely changed to 25Kv AC. The 25 kV AC system with overhead lines is used throughout the rest of the country. The dual-voltage WCAM series locomotives haul intercity trains out of Mumbai DC suburban region. The new AC/DC EMU rakes used in Mumbai are also designed to operate with both DC and AC traction as the Mumbai area switches over to the 25 kV AC system which has provided access to the locomotives having AC Traction motors to serve in the suburbs.

The Kolkata Metro uses 750 V DC traction with a third rail for delivering the electricity to the EMUs. The Kolkata trams use 550 V DC with overhead lines with underground conductors. The catenary is at a negative potential.

The Delhi Metro uses 25 kV AC overhead lines on the ground-level and elevated routes, and uses a rather unusual "rigid catenary", or overhead power rail, in the underground tunnel sections.

Read more about this topic:  Railway Electric Traction, Unit Types, Multi-system Units

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