National Rail say all four lines through Radlett in Hertfordshire affected by the downed power lines are now running but there are still delays.
Electric services are running on the slow lines and diesel services on the fast lines. There will be further repairs planned for tonight.
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.