My son's new J 4-8-4 arrived today and seems to be dead on arrival.  The directional lights work, but no motor.  He was devastated.  I contacted the seller, who was very nice, and offered to take it back and give a refund, but he doesn't have a replacement.

Does anyone have any advice for what might be wrong? 

I'm wondering if it is something simple like a common spot where wiring comes loose, special transformer required to power it, etc.

Any help appreciated

Steve