1911: The first escalator on the London Underground opened at Earl’s Court station on 4 October. A man with a wooden leg, William “Bumper” Harris, was employed to ride up and down the newfangled device to give timid travellers the confidence to use it. Hmm. Yes.
Source: Christian Wolmar, The Subterranean Railway: How the London Underground was Built and How It Changed the City Forever (2004), p. 182; email from London Transport Museum, 12 March 2009