Petersville Railway - 'Under Layout' Wire Support Hangars.. [Hints & Tips] A simple way to support and run your electrics under your layout is by way of using a wood screw [10g x 40mm] and a couple of cable ties. The enitre DCC Hardware Electrics on Petersville Railway is done this way ~ Bus Wires, Loconet cables, Stationary Decoder wires, Signal wIres etc.. Just using your tech gun just screw up exactly where you want one to go and easy to un-screw change to new spot..