There have been severe delays for some passengers this morning. Replacement buses are running on London Midland and Virgin services between Milton Keynes and Northampton - and on to Wellingborough to pick up connections to London. It's being caused by overhead line problems.
Overhead line problems have again brought rail delays in the Northampton and Milton Keynes areas.
Thousands of train passengers are potentially facing severe delays until the end of the week due to "extensive" damage to power cables.