Rail commuters in Bedfordshire, Northamptonshire and Hertfordshire will have another day of major delays.
There are delays of up to 60 minutes on East Midlands services.
First Capital Connect are warning that there are delays between Luton and London St Pancras International of 30 minutes.
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.