Train passengers have reacted with anger after signalling problems caused delays at Wandsworth Common station and Wimbledon this morning.
Passengers turned to social networking site Twitter to vent their frustration.
One user, Timmo, said: "I've been on the 'fast' train from Woking and after 45 mins haven't reached Clapham yet."
Another tweeter, David Martin, said: "The Clapham area is a first class joke when it comes to travelling at peak times. #squeeeeeeze."
Normal service on Southern Trains has now resumed after services between West Croydon and Victoria, Epsom and Victoria, New Cross Gate and Victoria and Sutton and Victoria were affected.
However a second major signalling failure at Wimbledon station is still causing delays and disruption to passengers travelling to or from Waterloo.
The signalling failure has been fixed by South West trains but knock on delays of up to 30 minutes are expected on services running to and from Waterloo until 12pm.
A spokesperson for the South West Trains said: "Services to and from Waterloo are currently being disrupted as a result of a signalling problem at Wimbledon earlier this morning.
"There was an issue with the signalling at Wimbledon signal box, which controls the signals between Vauxhall and Waterloo, between 07.00 and 07.30 this morning.
"The signalling has been fully restored, however due to the large volume of trains operating into and out of Waterloo around this time, this has caused knock-on delays to services this morning. The majority of trains are now running, but with up to 30 minutes delay.
"We apologise to our passengers for the inconvenience this will have caused to their journey this morning."
South West Trains tickets are being accepted on the tube, buses and Southern and First Great Western.
To check your journey visit www.journeycheck.southwesttrains.co.uk, or follow @SW_Trains