Thank you Len

 I am new to this and I have unpacked a very old train set. I think it is the Night Before Christmas set, model 90037 large set. And of course it doesn't work. Turn on power and nothing happens. I've checked the wire connections, track pieces are connected and clean.
 My question is, should the engine wheels spin freely? Mine do not.
 How do I test the engine to see if that is the problem?
Thank you,