A cable fire has led to a complete cancellation of train services into and out of London Marylebone, Network Rail has said.
The fire was reported at 4am and destroyed data and power cables taking out all the signalling between Marylebone and Neasden Junction. Trains passing through Leamington are among those affected.
At 8am today Network Rail said engineers were still waiting for fire fighters to finish damping down the blaze so they can get on to the viaduct to begin repairs, which are likely to take at least 24 hours.
Chiltern train passengers who had planned to travelto and from Marylebone today are advised to use another station or another route. Chiltern tickets are being accepted by Virgin, London Midland, CrossCountry and GWR.
Martin Ball, area director for Network Rail, said: “Engineers will make the necessary repairs as soon as they are safely able to do so. I know how frustrating incidents like this are for travelling customers, who are at the front of our mind as we seek to fix this problem.”