How to Wire a Model Railroad for Block Operation With DCC control systems so prevalent, the art of wiring a model railroad for multiple train operations with conventional DC power supplies isn't spoken about very often. DC block control remains a viable means of powering a layout, and you can always convert it to DCC in the future.Author: Ryan Kunkle Model Railroad Wiring Tips for DC and DCC Layouts Useful Model Railroad Wiring Tips. Wiring 1.5 v light indicators This is a circuit that Gord Baverstock uses on his Owen Sound HO-scale DC layout. Bill Payne of our Nottawasaga Model Railroad Club helped me test the circuit on my workbench to make sure I had done the drawing correctly. This is designed for a DC layout, not DCC.