Fzr Katihar Spl at left at Teknewas ....at right is ANVT bound Lichchavi Exp.
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IR men blows flag for clearance....green flag in left hand n red flag in right hand..while green discuss everything Ok n clear move and if any issue, like coach tilt, smoke etc, the fellow will blow red flag..its kept in right hand as right hand quickly respond.
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The...
more... custom arose from the idea that the right hand is usually the more vigorous one for most people and the red danger signal could be shown more promptly in case of a problem.