References: [1] European Committee for Electrotechnical Standardization (CENELEC). (1999). EN 50126 – Railway applications - The specification and demonstration of Reliability, Availability, Maintainability and Safety (RAMS).
[2] European Committee for Electrotechnical Standardization (CENELEC). (2001). EN 50128 – Railway applications - Communication, signalling and processing systems - Software for rail way control and protection systems.
[3] European Committee for Electrotechnical Standardization (CENELEC). (2003). EN 50129 – Railway applications - Communication, signalling and processing systems - Safety related electronic systems for signalling.
[4] International Electrotechnical Commission (IEC). (2007). IEC 61131 – Programmable controllers. 2000-2007.
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