Rail services return to normal after Bletchley derailment
A "normal working service" has resumed on the West Coast mainline in Buckinghamshire, say Network Rail.
The line was closed for more than 12 hours on Friday after a freight train engine derailed at 02:30 GMT in Bletchley.
It had been partially reopened on Friday afternoon after initial repairs were carried out.
Operators including London Midland, Southern and Virgin trains ran revised timetables over the weekend.
Network Rail said: "As of 06:30 GMT on Monday 6 February, a normal working service resumed between Milton Keynes Central and Euston."
The driver, who was treated for injuries, had been the only person on board the electric locomotive, which was not pulling any freight or carriages.
A spokesman for Network Rail said the Freightliner locomotive appeared to have approached a set of points at Bletchley south junction too fast.
This caused the tracks to buckle, damaged wooden sleepers and brought down some overhead cables.
The Rail Accident Investigation Branch is conducting an investigation.
The Freightliner engine was being operated on behalf of Virgin trains, hauling some of its older trains.