Transport Secretary Heidi Alexander is expected to tell Parliament on Wednesday that there is "no reasonable way to deliver" the railway line on schedule and within budget - but is not expected to say when the route will finally start operating.

She is set to outline the findings of two reviews into HS2, one of which points to a "litany of failure" leading to missed deadlines and ballooning costs. It is the latest setback for the high-speed rail project, which has been scaled back and delayed repeatedly. Alexander is expected to say that Conservative governments presided over the cost of HS2 rising by £37bn between 2012, when the line was first approved, and the general election last year.

She is set to release two reports into HS2 in a bid to "draw a line in the sand" and mark a government reset in how major infrastructure is delivered.