There are still considerable risks in delivering a multi-billion cross-London railway programme by its target time of 2019, an influential group of MPs have concluded.
The Public Accounts Committee (PAC) warned the £15.8 billion Crossrail project had been undersold by the Department for Transport (DfT).
As a result, the DfT had mixed success securing contributions from businesses and Heathrow Airport Ltd would now only provide £70 million - less than a third of the funding originally agreed.
Costing £14.8 billion, with the trains costing a further £1 billion, Crossrail will stretch from Reading in Berkshire to the west as far east as Shenfield in Essex and will transform cross-London train journeys.
However, PAC praised the project for being "broadly on schedule and delivered within budget"