I just purchased 2 55 Ton Three-Truck Shays (1:20.3 Large Scale) and when placed on the track with juice turned on, they will not operate. I am thinking they have a switch somewhere for track or battery power but no instructions were supplied to inform me of this. I feel a little stupid for asking but can someone help me with this? I am using a Bridgeworks Magnum 10 amp transformer to power the track.