Flying Scotsman

The Flying Scotsman was a train that drove into the Doctor's TARDIS in London in November 1963. While looking for Susan Foreman in 76 Totter's Lane, Ian Chesterton and Barbara Wright cited several things about the junkyard that could be considered strange but the First Doctor acknowledged the slight lateness of the train as the only thing out of the ordinary. (NOTVALID: An Unearthly Child: The Unscreened Edition)