HS2 boss Sir David Higgins has said the project was "vital for the future of the country".He added: "The cost and impact have to be recognised and acknowledged, but so too do the cost and impact of doing nothing.
"Without HS2, the people of this country will continue to face the failures of our transport system on a daily basis.
"This contingency has pushed the price of phase one, from London to Birmingham, up to £21.4 billion with £3 billion for the trains, while the cost of the second phase, taking the line in a Y-shape to north west and north east England is put at £21.2 billion with around £4.5 billion for the trains."
Launching his report in Manchester, Sir David Higgins, HS2's recently appointed chairman, will say that he would like work to start on the second phase at the same time as the first phase.
The second phase, taking the line in a Y-shape to north west and north east England is set for completion around 2032/33. He is also expected to recommend a completely new station at Euston - the site for the line's London terminus.
Sir David, the former London Olympics supremo who has joined HS2 Ltd after being Network Rail chief executive, is also expected to recommend scrapping plans to link HS2 with HS1, the London to Kent coast Channel Tunnel high-speed line.
The HS2 high-speed railway project is needed because without it, the existing rail network will be "full by the mid-2020s", the Department for Transport said today, after the Institute of Directors slammed the initiative.
A spokeswoman said: "The scheme is forecast to generate over £50 billion of benefits for the UK economy but we know we must maximise every economic benefit HS2 has to offer.
"That is why the HS2 Growth Taskforce was created, headed up by Lord Deighton, to work with city and business leaders to ensure we are capitalising on every opportunity to help regeneration, job creation, investment opportunities and in building a skilled UK economy."