Rail lines reopen between Reading and Paddington
Rail lines between London Paddington, Heathrow Airport and Reading have reopened following earlier disruption.
Network Rail confirmed engineers have fixed the damaged overhead electric cables on the route.
The company apologised for the problems caused to passengers' journeys this morning.
A spokesperson said: "We'd advise passengers to check before they travel via National Rail Enquiries or their local train operator."
National Rail said trains could still be cancelled, revised or delayed by up to 60 minutes.
Customers who still face disruption can use their tickets on London Underground and London bus services via any reasonable route at no extra cost.
Tube strike
More travel problems are expected in London, as Tube staff began strike action on Friday - with the impact expected to be felt by passengers from Sunday evening.
Transport for London (TfL) has advised people to complete their journeys by 17:30 GMT, with little or no service anticipated on the Underground until 12 January.
You can find more information of what services are running on the TfL website.
The earlier problems in Reading were the latest rail disruption to hit Berkshire after the county's railway lines were affected by flooding on Friday.
It is still being felt in some areas and GWR said: "Due to heavy rain flooding the railway between Reading and Westbury fewer trains are able to run.
"Train services running to and from these stations will be cancelled, delayed or revised. Disruption is expected until the end of the day."
The rail company has also warned that routes from Paddington to Didcot Parkway, Oxford and beyond are also affected.
There is disruption on multiple GWR lines between Paddington, Bristol and stations in the West Country, Devon and Cornwall.
Travellers are advised that they may use their tickets on suitable Southern, Thameslink, Heathrow Express, London Underground and London bus services.
Follow BBC South on Facebook, X, or Instagram. Send your story ideas to [email protected].