What is the purpose of the white lamps fitted to the rear of signals?

July 14, 2019, 2:58 PM
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Signals that face away from the signal cabin are provided with back lights to enable the signal operator to see the aspect of the signal. Normally a single white lamp is lit when the signal is on, and no lamp is lit otherwise. For stop signals that can show the Attention indication, two white lamps are visible in the on aspect and no lamps otherwise (distant signals that can show Attention have only a single back light).

Source – IFRCA.org

 

 

 

 
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