HS2 has been rated as "unachievable" as a part of an annual report from a authorities watchdog.
The Infrastructure and Projects Authority (IPA) gave the primary two phases of the rail hyperlink - from London to Birmingham, and from Birmingham to Crewe, a "red" score, saying the entire plan might should be "reassessed". Both legs have confronted a collection of delays.
The challenge has been hit by ever-increasing prices - with estimates rising from £33bn in 2010 to at the least £71bn.
The preliminary opening date of 2026 has fallen again to 2033, with the road presumably not reaching Manchester till 2040.
The authorities announced further delays to HS2 earlier this 12 months in an effort to "balance the books" after inflation hit the price of supplies.
But analysis exclusively leaked to Sky News confirmed the two-year pause in works would find yourself being three-and-a-half years, and was more likely to price the taxpayer at the least £366m.
In its report, the IPA stated: "Successful delivery of [HS2] appears to be unachievable."
The watchdog added there have been "major issues with project definition, schedule, budget, quality and/or benefits delivery, which at this stage do not appear to be manageable or resolvable".
As a end result, it stated the challenge "may need re-scoping and/or its overall viability reassessed".
This newest criticism is available in the identical month that HS2 Ltd's chief govt, Mark Thurston, introduced he would be resigning from his submit in September.
A Department for Transport spokesman stated: "Spades are already in the ground on HS2, with 350 construction sites, over £20bn invested to date and supporting over 28,500 jobs.
"We stay dedicated to delivering HS2 in essentially the most cost-effective method for taxpayers.
"HS2 will bring transformational benefits for generations to come, improving connections and helping grow the economy."
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