TORY MPs are demanding the full details of Railtrack's fall into administration in 2001 under the new Freedom of Information Act.
Under the new laws, which came into force on January 1, public authorities - including the biggest Government departments - are obliged to open their files to anyone who requests information.
The Conservatives want to know how the Department for Transport and the then transport minister, Stephen Byers, came to the decision and what the projected and actual cost of the administration was.
They are also asking for information on claims that the Government cut back the road- building plans of the previous Conservative administration from 150 to just 37.
A breakdown of legal and other costs incurred by the DfT in its dispute with London Mayor Ken Livingstone over the Tube public private partnership deal was also requested by the party.