why most of the train colour is blue? and why are all postbox are red?
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Answer:
Between 1866 and 1879 the hexagonal Penfold post box became the standard design for pillar boxes and it was during this period that red was first adopted as the standard colour. The first boxes to be painted red were in London in July 1874, although it would be nearly 10 years before all the boxes had been repainted.Painters in Southampton left behind a conclusive clue, in the shape of an unbranded notice taped to the side, stating: "This box has been painted blue to celebrate the 2019 Cricket World Cup." ... Blue post boxes are not an entirely new phenomenon - they were introduced for air mail letters in the 1930s.IR till 1996 had Reddish colour on all trains. Later when the brakes were changed to vacuum brakes they changed the colour for identification.Now all ordinary trains have blue colour.