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Commuters are facing rush hour misery as four Tube lines and several Overground services were hit by delays and cancellations as temperatures soared to 25C.

The Circle line was suspended, and the District, Hammersmith & City and Metropolitan lines reported disruption after a signal failure at Edgware Road.

There are severe delays on the Circle and Hammersmith & City lines.

A spokeswoman for Transport for London said: "We apologise for the disruption caused to Tube customers this evening, which was due to a severe signal failure at Edgware Road.

"Our engineers were on site immediately and the issue has now been resolved."

Affected services Circle line District line Hammersmith & City line Metropolitan line London Overground Southern Southeastern South Western

It comes as passengers hoping to travel home on London Overground, Southeastern, Southern and South Western trains were warned of a number of incidents affecting services.

One passenger, Paul, told the Standard he witnessed "total chaos" at Great Portland Street station, with hundreds attempting to board trains.

He said: "I was getting on at 5.30pm. It was total chaos, but back upstairs they were carrying on letting people on to the platform.

"It was positively dangerous. There was hundreds of people.

"There's always a lot of people between trains, so imagine how many there were when no trains are coming."

The London Overground is suspended between Clapham Junction and Willesden Junction due to an earlier faulty train.

Southeastern urged passengers travelling home from London Bridge to check before they travel as disruption to services is expected until 7pm, with possible cancellations and delays of up to 45 minutes.

This is due to a fault on the signalling system near to the station, the rail company said in a statement.

A number of services will run from London Blackfriars or London Victoria this evening to reduce delays in the area, it added.

Southern Rail said a number of incidents on the network are affecting services.

Disruption between East Croydon and Brighton is expected until 7pm due to incidents including a signalling fault, points failure and problems on the Overground.

Meanwhile damage to a railway between Milton Keynes Central and East Croydon means trains may be cancelled or delayed until 5.30pm.

And due to a signalling problem between London Waterloo and Woking some South Western Railway trains will have to run at a reduced speed, the rail company said. Trains may be delayed or revised until 8pm.

Commuters vented their frustration online as trains sat stationary on platforms across the capital.

Sian Thomas wrote on Twitter: "Way to ruin the first sunny day of the year for your customers TfL."

Others reported being delayed by more than two hours amid the evening sunshine.

Donna Turner asked Southeastern: "Is it too hot for the trains to run on time?"

South Western said in a statement: "We have been made aware of a track circuit failure in the Wimbledon area which is affecting the fast line travelling in the Woking direction.

"A track circuit is a method that our signallers use in order to see where the trains are on the track.

"Therefore until this is fixed trains have to come to a stop and seek verbal permission to move forwards through the signal."

London Underground tickets will be accepted via reasonable routes including London buses, C2C and South Western Railway.