Three years after the amalgamation of all of the Underground lines into one network under the London Passenger Transport Board in 1933, the Circle line name was used for the first time. But until 1949 ...

the Circle line name was used for the first time. But until 1949 it was not given a distinct identity on the Tube map, finally adopting its distinctive yellow colour in that year. For the next 60 ...

The Circle line name was ... a distinct identity on the Tube map, finally adopting its distinctive yellow colour in that year. For the next 60 years, the line’s route remained unchanged, with ...