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 centers. 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.

GSM-R could be supplanted by LTE-R, with the first production implementation being in South Korea. However, LTE is generally considered to be a "4G" protocol, and the UIC's Future Railway Mobile Communication System (FRMCS) program is considering moving to something "5G"-based (specifically 3GPP R15/16, i.e. 5G NR), thus skipping two technological generations.

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