The Government will today raise the amount it expects to be invested in infrastructure projects in the UK from £309 billion last year to more than £375 billion.
Almost 300 of the 646 projects and programmes are already under construction.
Chief secretary to the Treasury Danny Alexander is expected to announce:
The building of the UK's first toll road in a decade is to be scrapped. The A14 between Cambridge and Huntingdon will not introduce a fee for use after the improvement scheme, due to start in 2016, is completed.
The railway station at Gatwick Airport will receive £50 million for redevelopment.
A Government guarantee could support finance for the development of a new nuclear power station at Wylfa on Anglesey.
The tube's Northern Line £1 billion extension to Battersea in south west London will be guaranteed.
Improvements to the A50 around Uttoxeter in Staffordshire will start no later than 2015/16.
A £10 million competitive fund to open in early 2014 to test ways to deliver superfast broadband to remote areas of the UK.
The Government is expected to announce plans to sell its 40% stake in the cross-channel Eurostar as part of a target to raise £20 billion through the privatisation of financial and corporate assets by 2020.
Danny Alexander, the chief secretary to the treasury, will announce the Eurostar sale as part of a wider £375 billion investment programme to 2030 and beyond, called the new national infrastructure plan (NIP).
Last month Eurostar revealed it had seen an increase in revenues and passenger numbers compared with last summer.
Sales revenue for the period July-September 2013 reached £207 million - a 10% increase on the same period last year - and passenger numbers in summer 2013 rose 5% to 2.7 million.
Eurostar says it will pay for special ambulance to take a morbidly obese man from London, via ferry, to France. 22-year-old Kevin Chenais was stopped from travelling by train because of concerns over safety.
This afternoon, Eurostar said:
"Having arranged overnight accommodation in central London for Mr Chenais and his family, we contacted P&O last night to request their assistance arranging passage across the Channel.
"Following receipt of the necessary safety clearance from P&O we paid for the family to be transported to Dover in a special ambulance where they will board the P&O 'Pride of Britain' bound for Calais later this afternoon.
"Upon arrival in Calais, the family will continue their journey in the same ambulance to their home in south eastern France."
A ferry company has agreed to help a morbidly obese Frenchman stranded in London after he was stopped from getting on a Eurostar train. P&O Ferries says it will take 22-year-old Kevin Chenais across the English Channel. Eurostar said he posed a significant safety risk.
P&O Ferries said:
"We're delighted to help. It's not difficult for us. We are used to carrying ambulances across the Channel, so we are set up for this type of thing.
"It's difficult to imagine the frustration that this gentleman has gone through.
"But for us, it's very straight-forward as we are set up to carry people who have medical needs."
“This is a terrible situation. Our heart goes out to Mr Chenais and his family who are understandably desperate to return home after being stranded in America," a Eurostar spokesman said.
"Unfortunately, there was no question that he would have been able to travel with Eurostar as we must observe very strict safety rules which govern travel through the Channel Tunnel."
The company said Mr Chenais’ immobility would have affected strict evacuation procedures in the event of an emergency, which may have posed a safety risk to himself, Eurostar officials and other passengers on board.
Eurostar confirmed that they had paid for Mr Chenais and his family to stay in London while they liaised with other partners to help find a solution to the 22-year-old's travel woes.
A Frenchman who was stranded in the United States because he was too heavy to fly has now been refused travel by Eurostar officials.
Kevin Chenais, 22, who weighs more than 35 stone, had been in the US since May 2012 after undergoing treatment for a hormone imbalance, but his plans to return home last month were thwarted after British Airways refused to accept him on to a flight.
After being rejected by the Queen Mary 2 cruise ship in his bid to sail across the Atlantic, Mr Chenais was finally accepted onto a Virgin Atlantic flight to Heathrow.
The Frenchman was greeted at the airport yesterday by French consular staff who arranged for the 22-year-old and his family to board a Paris-bound Eurostar train.
However, Eurostar refused entry to Mr Chenais as his lack of "mobility" did not coincide with their regulations for evacuation procedures.