We have developed two types of traction motors for a gauge change train. One type is a direct drive type synchronous motor using a rare earth magnet permanent magnet. The other type is a conventional cardan drive asynchronous motor. Type tests of the two types of motors showed good results. A high speed endurance running test of a gauge change train was carried out in the U.S.A. for about two years. During the running test, no trouble occurred with these motors. An overhaul inspection after the running showed no damage on the motors.