Flag

A flag is a piece of coloured cloth flown from a pole or mast, usually for purposes of signalling or identification. Flags were initially created for signalling (as in

Railway flags

Railways use a number of coloured flags, usually with the following meanings:

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• red = stop
• yellow = proceed with care
• green or white or blue = proceed.
• a flag of any colour waved vigourously means stop

At night, the flags are replaced with lanterns showing the same colours.

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Railway signals are a development of railway flags.

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