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.

Read more about GSM-R:  History, GSM-R Uses

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GSM-R Market - Railways Using GSM-R
... A fully functional GSM-R system is being trialed on the North Clyde Line in Scotland from 2007 ... For some years before these trials commenced however, GSM-R has been in use for voice-only purposes (known as the 'Interim Voice Radio System' (IVRS) ) in some locations where axle counters are used ... Britain’s GSM-R network should be fully operational by 2013 at a cost of £1.2 billion ...