There's a reduced service on the First Great Western line between Bristol and London Paddington.
Trains are being diverted via Newbury, and services are suspended between Cheltenham at Paddington, with replacement buses in place between Swindon and Didcot; Swindon and Gloucester; and Bath and Swindon.
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The Wiltshire explorer David Hempleman-Adams is leading an attempt to finish an historic expedition that was cut short 100 years ago.
It was 75 years ago that Bristol felt the full force of the Blitz. This evening Bristolians took to the streets to mark the anniversary.