Train-borne Equipment EVC and STM
European trains will be fitted with an ERTMS on-board system composed of a computer (EVC) and its peripheries, as the ERTMS system is deployed on rail networks throughout Europe. At this moment only certain corridors have been fitted for ERTMS. Trains running on these lines must therefore be equipped to run on both ERTMS lines and classic lines, which still rely on national (Class B) systems. Such a dual system is called a Eurocab. A STM (Specific Transmission Module) is a key element within the Eurocab. The STM handles the national Class B Automatic Train Protection Systems like PZB, Memor, ATB.
Read more about this topic: European Train Control System
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