LPTB
1 July 1933
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Metropolitan line (1933–88)
On 1 July 1933 London's Metropolitan Railway amalgamated with other underground railways, tramway companies and bus operators to form the London Passenger Transport Board (LPTB), and the railway became the board's Metropolitan line. The LPTB cut back services to Aylesbury, closing the Brill and Verney Junction branches, and invested in new rolling stock and improving the railway between Baker Street and Harrow-on-the-Hill, including the extension of the Bakerloo line which took over the Stanmore branch. World War II saw a suspension in these works, and it was not until 1948 that Harrow-on-the-Hill station was enlarged to six platforms. Steam locomotives were used north of Rickmansworth until the early 1960s when they were replaced following the electrification of the tracks to Amersham and new electric multiple units. London Transport withdraw its service north of Amersham at this time. In 1988, the route from Hammersmith to Aldgate and Barking became the Hammersmith & City line, the route from the New Cross stations to Shoreditch the East London line and leaving the current Metropolitan line as the route from Aldgate to Baker Street and northwards to stations via Harrow.