Great Western Railway trains between Bristol Parkway and Newport will be affected by 13 days of engineering work.
Network Rail will replace a bridge over Gipsy Patch Land in South Gloucestershire, near Patchway, between Sunday 25th October and Friday 6th November 2020.
The bridge is being replaced to allow a wider road to run underneath the railway and to prepare for an improved bus metro.
GWR Head of Commercial Development (interim), Dan Okey said: “This essential work ties-in with our wider plans for MetroWest to improve integrated public transport links in the city, providing more services and increased capacity.
“We have been working hard to make sure that people can be confident to travel safely, and that includes running as many trains and carriages as we can to make extra room, as well as enhanced cleaning and social distancing measures.
“Please do however, check before you travel and be considerate of others.”
Whilst the work takes place, trains between London and South Wales will be diverted on an alternative route, which will extend journeys by 50 minutes and trains will not call at Bristol Parkway.
Trans will operate hourly between London Paddington and Bristol Parkway on weekdays during peak hours. Direct London to South Wales trains will operate via Gloucester all day.
Replacement bus services will operate between Bristol Parkway and Newport.
Trains from Portsmouth Harbour to Cardiff Central will terminate at Bristol Parkway.
Trains between Taunton and Cardiff Central will terminate at Bristol Temple Meads.
Additionally, there will be no direct London Paddington to Cheltenham trains running on Sunday 25th October or Sunday 1st November.
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