Back in April, after 50 + years I begin renovating my American flyer train set. I was very naive and learning as I go. I purchased an American flyer 332 and try to run it with my AC transformer not realizing it had a DC motor.I don't remember whether I saw smoke or not but probably did and turn the power off immediately. I was informed I would need to put a bridge rectifier between the transformer in the track. I purchase a 6 amp bridge rectifier. The local ran but did not have much power. I was informed that the 6 amp rectifier was not powerful enough so I purchased a Dallee 1400 e unit. ouch! The train ran better but not great. BTW this was all before I joined this forum. Upon reading Claikens April 25th 2015 thread on his 332 motor issue I realize what I might have done. I recently disassembled the motor and notice the commutator add dimples on the surface. I resurfaced the commutator but the dimples were still there. I did not want to grind the commutator down too far. It also looks like some of the insulation has been melted. Should I grind the commutator down some more and see if that makes a difference or is this motor fried?