说明：  铁路信号设备是组织指挥列车运行，保证行车安全，提高运输效率，传递信息，改善行车人员劳动条件的关键设施。铁路信号的基础设备，包括信号继电器、信号机、轨道电路、转辙机等。
(Railway signaling equipment is to organize and command the train running, ensure traffic safety, improve transport efficiency, transmission of information, improve staff working conditions driving critical facilities. Based railway signaling equipment, including signal relay, signal, track circuits, switch machines and so on.)