All lines have now reopened and trains can run on their normal routes after disruption on First Great Western due to a signalling problem between Didcot Parkway and Swindon.
There are still delays of around 30 minutes to services and buses remain in operation. First Great Western expect normal service to resume from around 1pm.
First Great Western have just told us that buses are in place for travel between Swindon to Didcot, Swindon to Gloucester and Bath to Swindon, should passengers want to use them. There are reduced services running between Cardiff and Bristol to Paddington, with trains diverted via Newbury.
ITV News journalist Guy Phillips has just sent us the latest on his attempt to go to Wales. We "We are now boarding a train back to Reading. Great Western hope to get passengers from Reading to Wales via Bath - the long route."
Passengers trying to get to Cardiff are now heading from Didcot back to Reading, following a power failure in Swindon.
Passengers trying to get to Cardiff are now heading from Didcot back to Reading. Those going to Swindon and Bristol are awaiting a fleet of buses to help them reach their destination. Trains from Reading to Wales will go a long route.
ITV News journalist Guy Phillips is stuck at Didcot Parkway in Oxfordshire. His train has been terminated at Didcot. First Great Western Trains have promised buses to Swindon but Guy has been told many as buses are on the school run. Some passengers are heading back to Reading.
The power failure in the Swindon area has brought rush-hour trains between London, the Thames Valley, Wales & the Westcountry to a standstill. ITV News journalist, Guy Phillips, is one of thousands of passengers affected. He's just sent us this update.
The 7.11 from Reading to Swansea has been at a standstill at Didcot Parkway for 40 minutes due to amajor power failure. The guard on the train tells us "There is major signalling problems due an electrical fault. The only information we have is to stay here until it has been resolved."
Passengers are still facing long delays on the main route between Reading and Oxford due to a power failure in the Swindon area. ITV News journalist, Guy Phillips, is one of those affected. He's just sent us this update from his train stuck at Didcot.
"We're being told that we will have to wait here 'for a while' due to a big back log of trains. The power cut is affecting signalling." He will send another updates as soon as he's on the move or gets more information.