Kolkata Metro rolling stock

The rolling stock of Kolkata Metro consists of five classes, three classes for Blue Line, one of which is also used for Purple and Orange Lines, and two classes for Green Line.

All trains receive 750 V DC using third rail electrification system. Trains can operate up to eight (Blue, Purple, Orange Lines) and six (Green Line) cars in length.

Since Kolkata Metro was constructed in 1970s, there were some technical limitations. Due to the tunnel dimensions, and being under Indian Railways, Kolkata Metro opted Indian metre gauge shell (22.7 m (74 ft 6 in)) with 1,676 mm (5 ft 6 in) tracks for Blue Line, which was later used for Purple and Orange Lines. So the options of rake manufacturers for Blue, Purple and Orange Lines are very limited. On the other hand, Green Line uses the 1,435 mm (4 ft 8+1⁄2 in) standard gauge tracks similar to most other Indian metro networks.

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