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South West Trains say a problem at a level crossing between Barnes and Richmond means all lines will be blocked and services disrupted until around 6.30pm.
There are still major delays on South West Trains tonight after a signalling problem this lunchtime.
Mainline services between London and the south coast are being delayed by up to an hour. Some suburban services have been cancelled entirely.
A statement on the company's website says:
Disruption on South West Trains between London Waterloo and Barnes, and between London Waterloo and Wimbledon due to signalling problem.
All trains to and from Waterloo are at a stand-still at the moment.
Latest ITV News reports
Passengers travelling in and out of London are facing delays this morning after rail and underground services were cancelled or delayed.