Did you know that in 4,000 years ago flags were made out of metal, wood and clothing . The first people ever who invented flags were the Roman people. Many flags back then wasn’t.
Railway Flags can tell you when to stop obviously and when you can go. for example there are 6 colour which all has a different meaning . The first flag was made wood in the past some flags were heavy and , difficult to carry around , but now it has gone a lot lighter and a lot easier to carry .