Baker Street is one of the original stations of the Metropolitan Railway (MR), the world's first underground railway, opened in 1863. With ten platforms overall, it has the most London Underground platforms of any station on the network.
Restoration work in the 1980s on the oldest portion of the Baker Street station brought it back to something similar to its 1863 aspect. Of the MR's original stations, the sub-surface Circle and Hammersmith & City line platforms are the best preserved. Plaques along the platform show old plans and photographs of the station.