Life-Like / Walthers N-Scale GP18 split-frame mechanism with phosphor-bronze pickups, five-pole skew-wound motor, flywheels, and white LED headlights. The frame has been milled to accommodate the Digitrax DZ126T DCC decoder that has been installed, and you can see in the included photos. It runs very smoothly and quietly - please see the video included in the listing. It's in excellent condition and comes in the original GP18 box.