Trains will not run between Didcot Parkway and Swindon from August 2-3 due to improvement works on the track.
First Great Western said there will be delays on the London Paddington to Bristol Temple Meads line of between 20 and 75 minutes due to trains being diverted to different routes. There will also be fewer services than usual.
A rail replacement bus service will run between Didcot Parkway and Swindon and there will be extra services between Didcot and London Paddington.
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