TRAINS are now back on the move from Gloucestershire to London following cancellations this morning after signalling problems.
Signalling has been restored between Didcot Parkway and Bristol Parkway, and stationary trains are now on the move.
The signaller at Swindon reported that the panel signal box had blanked out this morning and that there was a loss of communications. Signals on the ground were also reported to be blank.
It led to train services being cancelled for more than three hours this morning, with replacement bus services causing journey times to increase by nearly two hours.
Engineers and operations staff investigated the failure, which was later diagnosed as a fault with a power transformer. The problems affected services over a wide area from Bristol Parkway and Bathampton to Kemble and Didcot.
A Network Rail spokesperson said: "A major signalling failure meant trains were currently unable to run through the Swindon area. This caused significant disruption to services on the Great Western Main Line between London, the Thames Valley, the west of England and south Wales.
"Engineers worked at a number of locations to rectify the fault and get trains moving as quickly as possible. We worked closely with First Great Western to divert or amend services where possible to keep as many people moving as possible, and other train operators also accepted tickets on alternative routes.
"Passengers were advised to check with their train operator or with National Rail Enquiries for the latest travel advice.
"There are a number of delayed services on the route at present and service alterations/cancellations can be expected for the next two hours."