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On the sign:
BAKER STREET
The Hound of the Baskervilles The faithful Watson goes alone to Dartmoor to help Holmes with the problem of the ghostly and gigantic hound that has caused the death of more than one Baskerville. But the hound proves to be as real as its footprints and Holmes, revolver in hand, arrives in the nick of time to save the latest quarry.
221B Baker Street is listed in Arthur Conan Doyle’s books as the residence of Sherlock Holmes. In light of this, the detective figure or quotes from the detective’s stories are displayed in the stations of the lines passing through this station.
The following photo, which is on the Jubilee line, shows a quote and illustration from the story "The Hound of the Baskervilles"