This is a Lionel 6-81317 O FasTrack Plug Expand Play Accessory Activator Lock On.
Use your train as a switch to activate your Plug-n-Play accessory When your train passes by, it completes the circuit and routes power to your accessory until the train has passed. Features Includes One 10 Insulated track section Two 5 isolated sections Plug-n-Play Power Lock-on made specifically for accessories fitted with a Plug-n-Play power cable
Condition: Factory New (C-9) Operational Status:Functional Original Box: Yes (P-9)
Manufacturer: Lionel Model Number: 6-81317 MSRP: $26.99
Scale/Era: O Modern Model Type: Track/Switches/Etc.