The Baker Street and Waterloo Railway (BS&WR), also known as the Bakerloo tube, was a railway company established in 1893 that constructed a deep-level underground "tube" railway in London. Although construction began in 1898, the company was then hit by the financial collapse in 1900 of its parent company, the London & Globe Finance Corporation, through the fraud of its main shareholder, Whitaker Wright. In 1902, the BS&WR became a subsidiary of the Underground Electric Railways Company of London (UERL). The UERL quickly raised the funds, mainly from foreign investors.

When opened in 1906, the BS&WR's line ran completely underground in a pair of tunnels for 5.81 kilometres (3.61 mi) between its Baker Street and Elephant and Castle. By 1913 extensions had taken the northern end of the line to Paddington. Between 1915 and 1917, it was further extended to Queen's Park and then to Watford; a total distance of 33.34 kilometres (20.72 mi).

Within the first year of opening it became apparent to the management and investors that the estimated passenger numbers for the BS&WR and the other UERL lines were over-optimistic. Despite improved integration and cooperation with the other tube railways and the later extensions, the BS&WR struggled financially. In 1933, the BS&WR was taken into public ownership along with the UERL and became part of London Transport. (Full article...)