The functions, working principles and working procedure of BE 6 monitoring device for signalling power are introduced in this paper.

介绍了BE-6型信号电源跟踪监测装置的功能、工作原理及工作过程。

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They are signalling power and status.

BBC: Neanderthals used feathers as 'personal ornaments'

The firm said it continuously monitors track, signalling, overhead power supply and other equipment for ageing and degradation.

BBC: England

Network Rail has upgraded power supplies and signalling systems and lengthened 41 platforms at 12 stations on the Midland main line north of London to accommodate the new trains which are nearly 270 yards (250m) long.

BBC: Longer trains set to ease congestion on Thameslink line