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The railway staff can sod off though, if you are in the UK. Trains drivers are supposed to have route knowledge that means they aren't looking at red lights that aren't relevant to them including on platforms. It would be different someone like Belgium where they drive on sight alone, and have different signalling overlaps etc as a result.
Railway Rule Book excerpt:-
In an emergency you can stop a train by giving a hand danger
signal. Obviously this must be clearly visible to the driver.
In daylight, hold out a red flag or raise both arms above your head.
In darkness or poor visibility, shine a red light or wave any light
vigorously.That is why they are not liked on platforms
You can swap it with mine if you like as the stand light bit is broken. Works fine when moving but switches off as soon as you stop. Apparently fairly common.
The railway staff can sod off though, if you are in the UK. Trains drivers are supposed to have route knowledge that means they aren't looking at red lights that aren't relevant to them including on platforms. It would be different someone like Belgium where they drive on sight alone, and have different signalling overlaps etc as a result.