You can replace the brushes and springs as long as the armature is not removed. The reason is on the type of magnets Lionel used as soon as the magnetic flux between the magnet poles is broken, the magnet looses about 40% of it's power. When reassembled the motor will run faster, Have less torque, and overheat. The magnet in the motor was magnetized after being assembled. In the '60's Lionel has a service tool available to repairmen to re-magnatize the assembled motor. Never use pulse power with these motors.
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