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IEC 62425 Ed. 1.0 b:2007
"Railway applications - Communication, signalling and processing systems - Safety related electronic systems for signalling"
"Applies to all safety-related railway signalling systems/sub-system/equipment. The hazard analysis and risk assessment processes defined in IEC 62278 and this standard are necessary for all railway signalling systems/sub-systems/equipment, in order to identify any safety requirements."
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International Electrotechnical Commission [iec]