European Rail Traffic Management System in Great Britain
The European Rail Traffic Management System (ERTMS) is an initiative backed by the European Union to enhance cross-border interoperability and the procurement of signalling equipment by creating a single Europe-wide standard for train control and command systems. Its main components are the European Train Control System (ETCS) and the GSM-R communications system.
Source: Wikipedia — European Rail Traffic Management System in Great Britain (CC BY-SA 4.0)