ac motor is nothing but induction motor.So check out for characteristics of induction motors.
electric motors
DC series motors...
An electric train uses electric motors. Modern trains have many motors, they are mounted on the axles, one motor per axle. Some axles will be powered and have motors on them, some will not.
dc series motors
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dc series motors are used because of torque vs speed characteristics.
The Apollo Lunar Roving Vehicle had 4 electric motors, one for each wheel, made by Delco. They were DC series-wound motors capable of 0.25 horsepower each.
dc series motor is used for traction...
Sometimes, for example in a separately excited dc motor. But in a series-wound dc motor the torque is proportional to current-squared, which gives the motor a very high starting torque and this makes series motors very popular for traction.
becoz of high starting torqe to move train
permanent magnet motors and series motor