Ruggedly designed and waterproof, this pocket sized radio remote control is used by ground personnel to apply brakes in an emergency. The GCS activates both Trackmobile and train brakes, and shifts the transmission into neutral. A groundman can activate brakes for safety while coupling train air hoses, or stop railcar movement in an emergency. The device has an operating range of more than 1200 feet [3700 meters], and has a range test function. The GCS operates on a long lasting battery with a low power warning light and offers frequency-hopping technology. No FCC license is required.