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It's possible the contacts on the battery are bent, so when the trains moves the contacts lose connection with the battery. remove the battery, paying attention to whether or not the contacts are tight on the battery. Use a small screwdriver to bend the contact out, so it pushes on the battery with more force.You may need to fold up a small piece of foil and put it behind the tag to keep contact with the battery.Typically there is a spring on one side of the contact and a small copper tag on the other. if the tag cannot be bent outward, you may need to use a pair of needlenose pliers to stretch the spring out -be careful though, you could break the plastic mount for the spring which would ruin the train and give you one unhappy conductor! Hope this helps and thanks for using Fixya!!
first of all check for at least 6 volts from the battery and the charger, you can test this using a multimeter, if the battery doesn't show any volts, lift up one side of the plastic housing on the top and verify that both the positive and negative wires are plugged in