铁路固定设备。轨道设施和维护工具。声检测锤。
Fixed railway installations. Track service and maintenance tools. Sounding hammer.
定期在线检测电气化铁道轨道电路参数，可确保信号设备工作在最佳状态，避免行车事故。
The electric parameters of rail circuit must be measured periodically to check if the signal system is in good condition and to avoid accident.
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