If the motor is one of those open frame Lionel universal motors, it may be that you didn't completely isolate the motor from AC voltage. I haven't cracked one open in a while, but as I recall, one brush lead goes to the pickup roller while the other goes to the chassis (common.) Reversing was accomplished by reversing the phasing (polarity) of the field coil. The way you can remedy this is to disconnect the brush leads and install a bridge rectifier with the plus/minus leads going to the armature, one of the AC leads going to the pickup roller and the other AC lead going to the chassis. This will feed a fixed-polarity DC voltage to the armature; the PS1 board would feed DC to the field coil and reverse it's polarity as appropriate.
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