Hi all,  My croc arrived a couple of weeks ago and got built last week. I put one of the 12v Technic motors (image below) in it and improvised a working, albeit imperfect, power pickup for the 12v centre rail. When I apply power I can hear the motor is wanting to work, and when I lift the centre unit (I haven't attached the end units in tests yet) off the tracks and supply power directly to the motor, it works fine and the wheels turn. Put it on the tracks, with power directly from the 12v power supply and it won't move, so my guess is that the rather old motor just doesn't have the power to get this wonderful loco moving.... Any insights or suggestions would be welcome.  Thanks, Andy