recently i started in model trains. no experience in the "n" scale. i bought a complete layout that was slightly damaged. in trying to repair, i found a small circuit that is connected to a "loop". it appears to have diodes arranged in a full wave rectifier and a dpdt relay plus other components. two pairs of wires connect track across insulator track connectors. applying dc to the track causes the relay to click on and off. if i try to run an engine it sits on the track and changes directions, forward and backward. what is the circuit for? help.
97corvette
97corvette