The Circle line name was not used officially until 1936 – but its existence is fundamental to the Tube’s early beginnings.

Delays on the Hammersmith and City, Metropolitan and Circle lines - There are currently delays on the Hammersmith and City, ...

Over the coming weeks, we’ll be using maps to tell ... a simple circle through Edgware Road. But in 2009, the Circle line was extended to include the route served by Hammersmith & City line ...