A term used to represent the speed and efficiency at which gossip travels. It draws to mind a train carrying rumours on it and depositing these rumours to everyone it passes.

If you find yourself in a situation where gossip is traveling fast, for example, a camp or a small high school, or you find out a news/gossip item that is fairly recent, you then say "Rumour Train!" noting that the piece of gossip is traveling at the speed of a train.

You may optionally say "Rumour Train, WOO WOO" afterwards to emulate the sound a train containing rumours would sound like.