Rail passengers have been plagued with problems with major disruption continuing on busy commuter routes into London from Bedfordshire, Hertfordshire and Northamptonshire.
Overhead power cable problems in Hertfordshire caused severe disruption to Wednesday night's evening rush-hour services. On Thursday, two of the four lines between Bedford and St Pancras in London remained closed.
East Midlands Trains journeys between Bedford and London St Pancras were delayed by up to 60 minutes. There were shorter delays on First Capital Connect and Southeastern journeys between Bedford and St Pancras.
Buses are replacing trains between Luton and Luton Airport Parkway and London.
Delays on First Capital Connect trains were expected run into Friday morning, and a spokesman said services would be affected all day on Thursday.
He added: "The damage is extensive - 1km of overhead power cables are down."
Buses are running between Wellingborough and Northampton to connect with London Midland services between Northampton and London Euston
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.