I have cleaned the track and lubed the engine, but it still will not move. Sometimes it gets power and lights up and the wheels turn but it won't move, and other times is wont even light up.

Now the light comes on but it just hums and doesn't try to move.

I just got my dads old 1987 Foley's track down to share with my daughter. I can get the engine to light up most of the time, and the wheels are turning but it won't move around the track. Is there anything I can do to get it to work?