Services to and from Paddington are currently being severely disrupted following two separate signalling problems at Acton and Hayes in west London.
Engineers have been on site since the incidents occurred and have worked through the night to repair extensive damage to lineside equipment, some of which has been damaged by fire.
Until the repairs are complete, two of the four lines serving Paddington will remain closed with an amended timetable in place to many destinations.
We would like to offer our sincere apologies to anyone who has had their travel plans disrupted as a result of these problems, particularly at this very busy time of year.
We have diverted all available resources to fixing the problems and will do everything we can to get a full service running as quickly as possible.
Passengers are advised to check with their train operator or National Rail Enquiries for further details.
More top news
Elizabeth Hurley told ITV News it was vital for those who survive the disease to continue to be supported after their recovery.
The mother of Shane Virami are taking Thomas Cook and a friend of his to court over his death.
The OktoberFest beer festival, due to take place this weekend, has been cancelled at the last minute.