6European Committee for Electrotechnical Standardization. EN 50129 Railway applications-safety related electronic systems for signaling[S]. Brussels: European Committee for Electrotechnical Standardization, 2003.
7European Committee for E lectrotechnical Standardization. EN 50128 Railway applications-software for railway control and proteetion systems[S]. Brussels: European Committee for Electrotechnical Standardization, 2001.
8ZHANG Yadong, GUO Jin. Research on some key issues in engineering safety management of rail transit signal system [C]// The Workshop on Environment, Construction and Transportation. America: IEEE Computer Society's CPS, 2010: 4672 - 4675.