An electric multiple unit or EMU is a multiple unit train consisting of self-propelled carriages, using electricity as the motive power. An EMU requires no separate locomotive, as electric traction motors are incorporated within one or a number of the carriages. EMUs are popular on commuter and suburban rail networks around the world due to their fast acceleration and pollution-free operation. One unit generally consists of three coaches of which one motor coach and shown by nomenclature like 1 (MC) +2 (TC).These are multiplied as two, three or four making it a 6/9/12 coach train as generally mentioned at the front of the train. So far maximum 12 coach EMU coach trains are in service in Mumbai. Titagarh has manufactured 19 rakes (171 coaches) of EMU and currently executing 3 rakes (27coaches) as of June 2016.