Tube travellers endured Monday morning misery today after signal failures caused the part suspension of two lines and delays to two others.
A signal failure at Seven Sisters in north London meant there were no trains on the Victoria line between Seven Sisters and Walthamstow and between Victoria and Brixton.
The Metropolitan line was suspended between Baker Street and Aldgate after a signal failure at Euston Square which also led to delays on the District line as well as the Hammersmith & City line.
There were also problems this morning for main line commuters on services run by the First Capital Connect and Southeastern train companies.
There were rush-hour delays of up to 30 minutes on trains running between Blackfriars and St Pancras stations in London.
This was due to an electrical supply problem in the Kentish Town area of north west London.
Meanwhile, cricket fans going to the fourth and final Test between England and Pakistan at Lord's this weekend will face travel disruption due to upgrade work on the Tube's Jubilee line.
On Sunday - the fourth day of the match - the Jubilee line will be suspended between Wembley Park and Stratford, while the entire line will be closed on Bank Holiday Monday - the last day of the Test.
This means that thousands of fans will be unable to use St John's Wood - the nearest station to Lord's - for the last two days of the Test.
Replacement buses will be in service to link the closed stations.
A number of other lines are affected by engineering work over the weekend, with the entire Victoria line closed on Saturday and Sunday.