Both commuters and tourists can struggle with the layout of the London tube map but a new circular design could end their travel woes.
A look back at some of the stops on London Underground's 150 year journey.
The first steam train to carry Tube passengers for over 100 years did a test run for the Tube's 150th anniversary celebrations in 2013.
Morning! Sol here. There are severe delays on the entire line while we deal with a signalling problem at Barking. Updates to followFrom @hamandcityline on Twitter:
Pat Hansberry, General Manager of the Northern line, said:
The Northern line had delays between Edgware and Camden Town this morning as a result of an earlier signal failure in the Clapham Common area. This has resulted in problems with restoring the scheduled service. Our line control and depot staff are working flat out to ensure a good service operates on the line, and I apologise to customers who have been delayed this morning.
Transport for London has referred people to the following link for information on compensation.
Transport for London has now changed the performance status of the Northern Line back to 'minor delays'.
Commuters are still reporting delays on the Northern Line, despite Transport for London saying that a good service is operating on the line.
Transport for London says that a good service is now running on the Northern Line.
Damian Bennett posted this picture of queues outside East Finchley Station at 8:53 this morning.
Laura, another commuter, posted a similar picture writing "Northern Line fail. I took this photo to text to my colleagues so they know the extent of my transport woes."