tunnel announciating device
... 速差制信号 speed signaling 隧道通知设备 tunnel announciating device 隧道遮断信号 tunnel obstruction signal ...
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以语音方式发出列车接近报警信息，通知桥梁或隧道中的工作人员注意和避让，保护人员和设备的安全。
Via speech sound, it was alarmed train approaching, noticed the men working in brige or tunnel to be careful and keep away fron track, protected the safety of men and device.
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