Shadow transport secretary Mary Creagh reiterated Labour's position that there can be "no blank cheque" for the HS2 rail project.
Ms Creagh said:
We must address the capacity problems that mean thousands of commuters face cramped, miserable journeys into cities like Birmingham, Manchester, Leeds and London.
But there can be no blank cheque and ministers must get a grip on costs.
More top news
"Important clarity" or the grounds for the "theft of democracy"? The PM's declared aims for negotiations have received a mixed response.
A divided theme across the UK today
400 people will run for mental health charity Heads Together, which was set up by William, Harry and Kate.