Hello everyone, hope you all had a nice Christmas or simply enjoying time off work. New here so hello (again). I was hoping for some advice with a second hand, class 91 loco I bought for my son (Lucas, 5). He is mad about the 91 (and 43), so got a second hand one which I tested before Christmas and it ran fine, however on trying today….no joy. when I take it off the body and check with a battery on the motor it runs fine, but when I put it on the track it won’t go. There is one wire that goes direct from the motor to the trailing bogie. If I put the contact on to to wheel or track the motor again will run, but not when I connect it back to the bogie proper. Any help would be most welcome Thank you for looking! Tim Dix (Dawlish)