Wiring turntable - Model Railroader Magazine - Model Wiring turntable. The Walthers built-up one with indexing is a 130' table. It's not really the same one as the kit built one. They just re-released it and it now includes a DCC decoder for controlling the rotation as well as the buttons. Simple Atlas turntable wiring with DCC - Model Railroader Jan 10, 2018Simple Atlas turntable wiring with DCC Posted by Benjamin Maggi on Wednesday, January 10, 2018 4:01 PM I am building a simple DCC layout and want to use the Atlas turntable, which has a split-rail ring design that automatically reverses polarity when it travels 180 degrees.