Part of Oral Answers to Questions — Transport – in the House of Commons at 10:35 am on 23 February 2012.
HS2 has done some major studies on that. I do not have the numbers in front of me, but it is clear that one of the major benefits of HS2 will be to free up paths on the existing north-south network for freight, and indeed for other passenger services, relieving the current congestion problems.