CBI sources said a team of agency visited Rail Bhavan today to collect the files on promotions and contracts which have figured in over 1000 calls intercepted by the agency during last two months.
However, the sources refused to given specific details of the contracts and promotions which are under scrutiny of the agency as it might adversely affect their ongoing probe.
The sources said if these records show any prima facie corruption or meet the claims made by the accused in the tapped conversation, the agency will register fresh cases in those issues as the present case relates only to alleged bribe Rs 90 lakh paid to Bansal's nephew Vijay Singla by the then Railway Board Member Mahesh Kumar for posting of choice.
They said the agency would also call for questioning the officials whose names figure in conversations between four accused--Singla, Kumar and middlemen Manjunath and Sandeep Goel.
The sources said agency is primarily focussing on the phone intercepts of these four persons as main conspiracy was allegedly hatched among them.
The agency is also likely to question Bansal in this connection and also senior members of the Railway Board who were privy to the promotion of Mahesh Kumar from General Managr to Board member.