GSM-R

GSM-R, Global System for Mobile Communications -- Railway or GSM-Railway is an international wireless communications standard for railway communication and applications.

A sub-system of European Rail Traffic Management System (ERTMS), it is used for communication between train and railway regulation control centres. The system is based on GSM and EIRENE -- MORANE specifications which guarantee performance at speeds up to 500 km/h (310 mph), without any communication loss.