The TPA added that the business case for the project has now fallen apart, with demand for travel uncertain. Other projects, it continued, would provide greater value for money.
However, earlier this month newly-appointed transport minister Chris Grayling said that he has no plans to back away from the project.
Grayling said the project to bring high speed train travel between London and cities in the North, including Leeds, Birmingham and Sheffield, will remain on track.
But the TPA continued to say that HS2 is unlikely to help develop the economy of North England to the extent that has been suggested.