Rolling Stock
The Chennai MRTS uses both 6-car and 9-car electrical multiple unit trains, although the 9-car trains are more prevalent during peak hours. The trains use overhead catenary for power supply and are broad gauge. They do feature neither air conditioning nor automatic train doors. The rolling stock of MRTS is same as that of other Chennai Suburban Railway lines. The power supply for traction is 25 kV voltage at a frequency of 50 Hz. For collecting power from 25 kV AC contact wire, pantographs are mounted on the roof of the traction vehicle. After a circuit breaker, the connection is made to a transformer that steps down this voltage to a level suitable for use by traction motors and control circuits. The DC supply for traction motors is made available through a rectifier circuit. A single train may have one or more motor coaches depending on the requirement. A 9-car rake is typified by 3 motor coaches each at the front, the middle and the last. The motors are used to run the wheels of the train at a stipulated speed limit. The MRTS coaches have entry and exit on both sides. The EMU coaches are manufactured by the Integral Coach Factory, Chennai.
Read more about this topic: Chennai Mass Rapid Transit System
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