Editing Jubilee line (section)

=== 1932 to 1939 ===
The first section of what is now the Jubilee line opened in 1932, when the [[Metropolitan Railway]] built a branch from its main line at [[Wembley Park tube station|Wembley Park]] to [[Stanmore tube station|Stanmore]]. The line, as with many others in the northwest London area, was designed for the use of commuters from the new and rapidly expanding suburbs. The line presented the Metropolitan with a problem. The suburban traffic had been so successful that, by the early 1930s, the lines into Baker Street were becoming overloaded, a problem exacerbated by the post-war flight from the [[City of London]] to the [[West End of London]].

At first, the Metropolitan had advocated a new deep tube line roughly following the line of the [[Edgware Road]] between the [[Edgware Road tube station (Circle, District and Hammersmith & City lines)|tube station]] and a point near [[Willesden Green tube station|Willesden Green]]. Indeed, construction advanced as far as the rebuilding of Edgware Road station to accommodate 4 platforms of 8-car length. Things changed, though, with the formation of the [[London Passenger Transport Board]] (LPTB) and the subsequent absorption of the Metropolitan line. The solution was now a new branch of the [[Bakerloo line]] from [[Baker Street tube station|Baker Street]] to serve new stations at [[St John's Wood tube station|St John's Wood]] and [[Swiss Cottage tube station|Swiss Cottage]], thereby rendering the existing stations of [[Lord's tube station|Lord's]], [[Marlborough Road tube station|Marlborough Road]] and [[Swiss Cottage (Metropolitan line) tube station|Swiss Cottage]] on the parallel route redundant, and negating the need for the Met's extension from Edgware Road station. It was originally proposed that the Metropolitan line's Swiss Cottage station would remain open during peak hours for interchange with the Bakerloo, and that Lord's station would open for special cricketing events, but both were closed permanently as economy measures during the [[Second World War]]. 

The new line rose between the Metropolitan line tracks at [[Finchley Road tube station|Finchley Road]], providing [[cross-platform interchange]] with the Metropolitan line. Continuing north to Wembley Park, the new Bakerloo line branch was to provide local service on the Metropolitan line, where Metropolitan line trains ran non-stop between Finchley Road and Wembley Park, cutting seven minutes from journey times. At Wembley Park, the new Bakerloo would turn north to serve Kingsbury, Queensbury, Canons Park and Stanmore, taking over the former Metropolitan branch. The Bakerloo extension, built as above, opened in 1939.