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Paddington was first served by Underground trains in 1863, as the original western terminus of the Metropolitan Railway, the world's first underground railway.
Paddington is served by four London Underground lines through two separate stations: the Bakerloo, Circle and District lines have a combined sub-surface and deep-level station to the south of the main line station, and the Hammersmith & City and Circle lines have a sub-surface station to the north. Circle line services go through both of the sub-surface stations as part of a spiral route. Although shown on the London Underground map as a single station, the two sub-surface parts are not directly linked.
The District and Circle Line entrance building is Grade II listed. Link

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