^The first escalator on the Underground was installed at Earl's Court in 1911. The first station built specifically for escalators was the new Central line station at Liverpool Street in 1912. All deep-tube stations built after 1913 were built with escalators - Wolmar, Christian. Beginning to Make Sense. The Subterranean Railway: How the London Underground Was Built and How It Changed the City Forever. Atlantic Books. 2004: 205–206. ISBN 1-84354-023-1.