The orange flag indicates that a train should be prepared to stop due to conditions it will be approaching. The yellow and red flag indicates that there is a temporary speed reduction followed by a stop signal. The yellow and green flag indicates that there is a temporary speed reduction, followed by an all clear.
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An orange light on a railway track typically indicates that a train is approaching and that the track is no longer clear.
Railway signalling principlesThe signal lights usually have four indicators: Green: clear to go. Double yellow: still clear to go, but indicates that the following signal may be a warning. Yellow: warns that the next signal may be red. Red: means stop or danger ahead.
1/2 It is called the cant line (some people simply call it the orange stripe). It was introduced (in the 80s following electrification... I think) as a warning (primarily to train workers) that going above the line would bring them dangerously close to hazards above the train...
Re: Train orange side hazard lightsOn slam door stock they were CDL lights as they were put in to tell us if the CDL was released of locked, but they are also used for power door stock to indicate the doors are shut and the driver should be able to get interlock to release the brakes.
The most constant signals and the easiest to understand are single-head block signals. Red means stop; green means proceed, and yellow means caution or approach, usually indicating that the next signal is red.
A red aspect (Danger) tells the driver that they must stop at this signal and they must come to a complete stop by the signal. They must not proceed past this signal and if they do, automatic emergency braking is applied and will bring the train to a halt.