The Rubbadubbers are playing with a toy train in the bathroom - but Tubb won't let anyone else drive it. 'If only it were a real train...' says Tubb, and his wish is granted. Suddenly, the Rubbadubbers are transported from the bathroom to a fantasy world, travelling in a real train. When Tubb says the words 'If only...' once again, the fantasy is over and they're safely back in the bathroom.