The circuit was called the internal circle in the parliamentary documents of the 1860s, since the metropolitan and district railroads began to build the first underground train lines of the capital.
His shared objective was to join the two lines in a circle under the center of London.
But the two companies fell on the money, causing a fierce rivalry between them.
Read more – A Letter History of the London Underground in 10 forgotten maps
The internal circle was planned when the subway was designed for the first time (Image: TFL corporate files)
This caused a delay in completing the internal circle, which was only carried out in 1884 after government intervention when the Mark Lane station was built, later renowned Tower Hill and relocated.
At first, the trains in the schedule were administered by the district railroad and the trains in the anti -Horary sense by the Metropolitan Railway.
Map of 1927 showing what parts of the inner circle were in the metropolitan line and what were in the district line (Image: TFL corporate files)
Three years after the amalgam of underground lines in a network under the London passenger transport board in 1933, the name of the circle line was first used.
Executive Map of London Transport 1934 (Image: TFL corporate files)
But until 1949 it was not given a different identity on the tube map, finally adopting its distinctive yellow color in that year.
During the next 60 years, the line of the line remained unchanged, with a train that traveled in both directions in a simple circle through Edgware Road.
The 2000 underground map shows the circle line as a circle: Hammersmith services had not yet begun (Image: TFL corporate files)
But in 2009, the Circle line extended to include the route attended by the Hammersmith & City Line trains between Edgware Road and Hammersmith.
The trains now travel in a loose spiral from Hammersmith, usually around the circle once before finishing in Edgware Road and returning through the same route.
On the morning of July 7, 2005, 15 people died in attacks of terrorist bombs in two circle trains, in Edgware Road and near Aldgate.
The first air conditioning trains were introduced into the line in 2013.
Today, the circle line is 27 km long and the services call 36 stations in total.
Due to its history as a separate service instead of an individual line, all stations in the circle line are called in at least another tube line.
Be sure to consult our website at the same time next week to learn about the history of the Northern line.