Commuter services were slowly returning to normal this morning after the rush-hour peak but there were still delays on a number of lines because of signal failures.

At the height of the chaos, Kings Cross was evacuated due to overcrowding and Mile End station shut for a while as the system tried to cope without key lines. Passengers told how they were told to abandon the train mid-journey and try another route.

At Kings Cross, British Transport Police said they were forced to shut the station after the delays caused a massive build-up of people on the concourse.

Passengers took to Twitter to express their amazement that the £500million development hadn’t built in room for such backlogs. The station was re-opened but there were significant delays.

The problems were compounded mid-morning due to a “passenger incident” affecting the Bakerloo line.

Latest from TfL: 10.30am

Bakerloo Line: Minor delays due to an earlier customer incident at Paddington.

Circle Line: Minor delays due to an earlier signal failure at Baker Street.

District Line: Severe delays between Barking and Upminster eastbound only, due to earlier signal failures at Aldgate East and Stepney Green. Tickets will be accepted on c2c services between Upminster and Fenchurch Street, Southwest Trains between Richmond and Waterloo and on London Buses via any reasonable route. Minor delays on the rest of the line.

Hammersmith and City Line: Minor delays due to an earlier signal failure at Baker Street. Tickets will be accepted on London Buses via any reasonable route.

London Overground: Severe delays between Clapham Junction and Wandsworth Road only, while we fix a signal failure at Forest Hill. Good service on all other routes.