Railway network operators are constantly faced with the challenge of enhancing the technical and commercial aspects of network operation. Standardisation of transmission procedures has created the conditions for optimising data networks. As a result, control and safety technology in railways is increasingly using the data communications technology already available, instead of proprietary technology.

The CENELEC standard EN 50126 and in particular the standard it spawned – EN 50159-1:2001 for closed transmission networks – are the basis for safety-critical communication in today’s safety systems in control and safety technology.

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