The Inner Circle project, initiated in the 1860s, aimed to connect the Metropolitan and District Railways' underground lines in London. This collaboration soured over disputes about financing, delaying its completion until 1884 due to government involvement. Initially, trains operated in opposite directions, with the Circle line officially recognized in 1933 after the merger of underground lines. Its unique yellow map designation began in 1949, maintaining a consistent circular route for decades before extending in 2009 to incorporate additional routes, reflecting the evolving nature of London's transport system.
The Inner Circle was originally part of a fierce rivalry between the Metropolitan and District Railways, culminating in the completion of the line in 1884 after government intervention.
Despite the Circle line's significant changes over the years, including a new identity on the Tube map in 1949, its fundamental circular route through central London has largely remained intact.
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