The chair of the Public Accounts Committee has written to the National Audit Office (NAO) calling for an official investigation into the Crossrail project.
The investigation would examine what was known and when about the scheme's cost overruns and delays.
The letter from Meg Hillier MP was prompted by the Department for Transport announcement in October that it would provide Transport for London with a £350m interim payment in order for the project to continue.
She wrote: 'I would ask you to examine the governance of the project, including what information was available to officials and when, and would welcome a firm timescale of when it became clear that the project would be delayed.
'I would also ask that you would look into what the circumstance were that led to its delay, as well as the additional costs incurred.
'Futhermore I would welcome clarification on when officials were aware that the programme was encountering major difficulties and how the financing deal from the department was agreed.'
A spokeswoman for the NAO said it has recieved the letter and would consider the request.
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