Ivy Lee
From Tardis Wiki, the free Doctor Who reference
The Ivy Lee was a Turret Class locomotive in service during the 1950s. It was visited by the Sixth Doctor and Evelyn Smythe during one of its excursions, when only two passengers were on board carrying documents from the War Office. The Doctor posed as a guard and reacted positively to being on the train, as he had taken up the hobby of trainspotting. (AUDIO: The Nowhere Place)