Wiring a Model Railroad Track | MRA Wiring a model railroad track is an essential part of any model railroad layout. Find out how important and helpful it can be to keep your wiring neat early on when wiring model railroad tracks. Wiring | National Model Railroad Association The standard way of wiring model railroads is to have the positive on the right hand rail when the loco is going forward. Just put the leads on the track so that the engine moves forward and to the right when the direction switch on the power pack is to the right. Swap the leads on the back of the pack if you need to.