The Grade Crossing Expander is a module used to expand grade crossing protection to include additional tracks. Each module performs the following functions:

Expands protection to include one additional track per module.
Detects trains approaching the grade crossing, and while blocking the road.
Uses the Grade Crossing Controller to operate the flashing crossbucks, sound the bell, and control the gates.
Up to 7 GCX modules can be added to a single crossing to protect a total of 8 tracks.
Combines grade crossing detection with your signaling system occupancy detection, if any.
Furnished completely assembled, with mounting hardware.
Download user's manual at no cost.
Requires a 12 VDC regulated power supply that can be shared by numerous other circuit boards.