Although the East London line had been an isolated shuttle since 1939, it was shown on London Underground maps as part of the Metropolitan line until 1968. In 1970 it was shown with a thin white line in the middle and labelled the "East London section". By the 1985 map it had become the "East London Line", remaining the same colour as the Metropolitan line with a white line in the middle, changed to orange by the 1990 map. In 1990 the Hammersmith & City line became a separate line from Hammersmith to Whitechapel (Barking during the peak), the Metropolitan line being from Aldgate to Baker Street and northwards to Amersham with branches to Chesham, Uxbridge and Watford.