HS2 could cost more than £100 billion and may not open until 2039, Britain's Transport Secretary Heidi Alexander has announced.
The Cabinet minister told the Commons she was "angry" about the "obscene increase in time and costs", which she blamed on "the failures of successive Conservative governments".
She said the expected cost of completing the high-speed railway was between £87.7bn and £102.7bn (in 2025 prices).
Constructing the line from London to Birmingham - plus the now abandoned onward legs to Leeds and Manchester - was initially estimated to cost £32.7bn (in 2011 prices), but the budget has spiralled.
The HS2 rail line was due to connect London and Manchester, but was severely curtailed by the last Conservative government.
Services were planned to launch in 2026, but the new target schedule is between May 2036 and October 2039.
