Train passengers have been urged to plan ahead due to upcoming weekend disruptions.
South Western Railway (SWR) has advised passengers to expect 30-minute delays on services between London Waterloo and Weymouth, which run via Southampton Central.
The disruptions are due to engineering work in the Wimbledon area.
The services will be affected on the weekends of January 18 and 19, and January 25 and 26. These trains will be diverted via Chertsey.
Passengers have been advised to check their journeys in advance at southwesternrailway.com/plan-my-journey.
Peter Williams, South Western Railway’s customer and commercial director, said: "Customers should plan ahead if they intend to travel on these weekends in January, as engineers carry out vital maintenance at one of the busiest parts of our network.
"There will be a large number of service changes, with rail replacement buses operating on our suburban routes, and with long-distance services revised and diverted. Diverted services will take around 30 minutes longer than usual, so customers should allow extra time when travelling."
“We are very sorry for the disruption and are very grateful for our customers’ patience.”
Mark Goodall, Network Rail’s Wessex route director, said: "There’s never a good time to close the railway, and I’m sorry we are impacting passengers in the Wimbledon area over consecutive weekends.
"We’ve worked hard to find the least disruptive window to deliver these essential engineering works. However, completing the upgrades back-to-back is the most efficient and cost-effective option for the taxpayer.
"If you're planning to travel during our works, please plan ahead and check your journey at www.nationalrail.co.uk or with South Western Railway for the latest journey information and travel advice."
Services between London Waterloo and Portsmouth Harbour running via Eastleigh will also be affected.
On Saturdays, they will operate only between Basingstoke and Portsmouth Harbour, and on Sundays, only between Eastleigh and Portsmouth Harbour.
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