Abstract:Train control center (TCC), which belongs to one of wayside equipment, is the core safety equipment of CTCS. TCC receives information from rail circuit and transmits to RBC via interlock system. Besides, TCC also has the functions such as rail circuit coding, storage and transfer of transponder Balise telegram, transmission of safty information between stations and temporary speed limit, all these functions can be used for backup system. This paper introduces system structure of TCC type LKD2-H which is applied in Zhengzhou Xi’an PTSL, analyse the external communication logic, interface structure and inner structure of main panels. The result testifies the TCC LKD2-H has the chacraters of fully functions, strong extensibility and outstanding interface functions, thus totally meet requirements for the train’s safty control in PTSL.