Shortly before 2pm a spokesman for Network Rail said: "Following damage to more than one kilometre of overhead line equipment at St Neots last night our engineers have been working around the clock to restore the best possible service for passengers.
"Two of the four lines have opened to diesel traffic, allowing a limited service to run. From around 2pm we will be able to 'coast' East Coast electric trains under the damaged area which will allow more services to run where rolling stock is available."
"East Coast services are stopping additionally at Huntingdon and Peterborough to allow First Capital Connect passengers to make connections.
"Engineers will be going back in tonight to continue repair work. Further information about services on Thursday will be issued as soon as it is confirmed.