The Eurolocking concept is a concept that is designed in accordance with the most stringent safety standards.  Based on a industrial PLC Eurolocking can  reach CENELEC SIL 4.

Eurolocking allows for fully scalable safety. The customer can add modules and logic circuits to raise safety levels in accordance with requirements. As a result, Eurolocking is equally suitable for use on marshalling yards and on open track

View the CENELEC SIL4 certificate