Trains reintroduced after safety checks prompted by crackspublished at 14:43 British Summer Time 13 May 2021
Trains taken out of service after cracks were found are to be reintroduced following "rigorous safety checks", the Rail Delivery Group says.
Some of the Hitachi Class 800 trains have cracks on the lifting plate, but as this is used for maintenance and not passenger journeys, regulators have agreed they are safe to return.
There has been disruption for passengers since Saturday
The rail minister warned travellers to expect disruption for "some time".
The Rail Delivery Group said Great Western Railway and London North Eastern Railway (LNER) will ramp up services.
Travellers are being advised to continue to check with their operator before they travel.