what is the motor they use for traction work?

Question

is it series or slip ring induction motor?
is it for any other characteristics other than high startin torque?
what is the supply voltage for lighting loads in trains and for motor loads?(india)
what type of braking they use in trains?

Answer 1

12,000 hits for traction "series motor"
18,000 hits for traction "slip ring"

http://en.wikipedia.org/wiki/Rail_transport_in_India
says there are "different track voltages"

"Most electrified sections in the country use 25,000 volt AC, but railway lines around Mumbai use the older 1,500 V DC system."

One would expect regenerative braking for an electric train. It would save energy.

http://www.tpub.com/content/neets/14177/css/14177_51.htm
confirms high start torque for series, and also mentions high speed under low load.