The two digital signal types are the on-off signal and the pulse train signal.

这两类数字信号分别为通断信号和脉冲序列信号。

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At present, the train signal systems include the fixed block system and the moving block system.

目前列车信号控制系统中有固定闭塞系统和移动闭塞系统。

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The train signal guiding system (on board) consisting of passive intermittent responder, train GPS system, and multiple computer checking system are equipped on the section.

站间是以车载设备为主的，由无源点式应答器、GPS列车卫星定位系统、多机校核系统构成的列车信号引导系统。

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They'll look at the brakes and performance of the trains, the condition of the tracks, crew performance and train signal information, among other things.

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But investigators are focused on a failure of the train tracks themselves, as opposed to an error by engineers or a failure of the train's signal system.

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The glow of Mombasa fades into the night behind us as our train clatters past derelict signal boxes and a decaying station lit by the feeble light of a paraffin lamp.

BBC: East Africa��s best kept secret