The Major Line Closure will see six kilometres of track replaced between Jesmond and South Gosforth, a section of line that has 30,000 passenger journeys each day, 450 train movements and a service every three minutes.
"Closing a Metro line for 27 days is a difficult decision but it is vital so that we can replace a key section of track in as short a time as possible. It will mean we can deliver a high quality Metro service for the next 50 years. I am sorry for any inconvenience caused by the work."**
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It's been confirmed that the Marks and Spencer stores in both Stockton and Darlington will close in August.
It's part of the investigation into the disappearance of Donna Keogh from Middlesbrough in 1998 when she was just 17 years old.
The move is likely to lead to the loss of more than 1,500 jobs.