Commuters complained they have been hit by travel “chaos” this morning after trains in and out of Euston were cancelled in the morning rush hour because of a power supply failure.

Travellers said they had been left stranded as they were unable to catch trains in and out of the busy central London station.

The problems appear to have been caused by a power supply problem in Queen’s Park in north west London, which has affected signalling on the railway.

Some trains from heading into the capital from the north of England are being terminated early at Milton Keynes because of the problems.

Richard Morris tweeted: “No trains running out of Euston. Nightmare. Chaos.”

Diana Spencer wrote: “It would happen to me! Power outage North of Euston means my first London trip in 2 years is chaos.”

Lee Bearton wrote: “Train chaos power failure but train manager on 06.59 Virgin Milton Keynes to Euston, was brilliant. Kept us posted and gave water”, along with the hashtag “how it should be done”.

A spokesman for Virgin Trains said: “There are National Grid power supply problems which are affecting signalling in the Queen’s Park area in north west London.

“That has impacted on all trains to and from Euston. We cannot currently run any trains out of the station. We are giving customer advice on alternative routes.”

He said Virgin Trains was first alerted to power supply problems just after 7.30am this morning.

But he was unable to say when he expected the problems to be resolved and train service to return to normal.

Transport for London warned that Tube service in the area will be very busy as commuters try to find another route to their destination.

National Rail Enquiries tweeted: “Major delays between Watford Junction and London Euston/Clapham Junction expected until 11:00am.”

London Midland, London Overground, Southeastern and Virgin Trains were affected by the problems.

Signalling difficulties between Willesden Junction and Shepherd’s Bush in London also caused delays of up to an hour to trains between Willesden Junction and Clapham Junction.

Meanwhile, services out of London Waterloo were disrupted after a person was hit by a train in the Kingston area, causing delay of up to 30 minutes to trains to Teddington.

A Network Rail spokeswoman said: “We experienced a loss of external power supply just outside Euston station, affecting all trains in or out of the station. Tickets are being accepted on alternative routes.

“We would like to apologise to all passengers for the inconvenience caused. We would like to assure passengers that our engineers are on site and have worked hard to re-establish the power supply as quickly as possible.

“Trains are now on the move but are subject to significant delays.”