GSM-R
GSM-Railway (or GSM-R) refers to a variant of GSM used with railways. Wikipedia describes it as "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."
TelcoBridges and GSM-R
TelcoBridges supports GSM-R with its Tmonitor line of network monitoring solutions. These have been adopted by various national railways in Europe.