Rail passengers travelling between Didcot and Swindon tonight are still facing delays of about half an hour due to signalling problems.
Great Western Railway said the delays could last until about 8.15pm.
It earlier said passengers were being hit by hour-long delays.
A statement on the company's website said: "Due to a fault with the signalling system between Didcot Parkway and Swindon fewer trains are able to run.
"Train services running through these stations may be delayed by up to 45 minutes or revised. Disruption is expected until 8.15pm.
"All stations and routes will continue to be served but in certain cases with a reduced frequency of train service."
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