lionel 81317 fastrack accessory activator

FASTRACK ACCESSORY ACTIVATOR TRACK PACK Use your train as a switch to activate your Plug-Expand-Play accessory When your train passes by, it completes the circuit and routes power to your accessory until the train has passed. -- Pack Includes: -- One 10" Insulated track section -- Two 5" isolated sections -- Plug-Expand-Play Power Lock-on made specifically for accessories fitted with a Plug-Expand-Play power cable