“Successful delivery of the project appears to be unachievable. There are major issues with project definition, schedule, budget, quality and/or benefits delivery, which at this stage do not appear to be manageable or resolvable. The project may need re-scoping and/or its overall viability reassessed.”

https://www.theguardian.com/uk-news/2023/jul/30/hs2-officially-unachievable-red-rating-problems-london-birmingham