Tens of thousands of people will be heading into the city centre....
It's part of 'big and complex' track replacement works....
Here's everything you need to know....
It's so part of ongoing £150m engineering works can be carried out....
It's one of several new improvements....
It's described as being one of the 'most significant' programmes ever undertaken....
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Local leaders are hoping to make it the 'Kings Cross of the North'....
