The CBI finalised its chargesheet in the case and sent the file to the Directorate of Prosecution seeking legal opinion on the evidence found and allegations brought against Kumar.
The CBI arrested Vijay Singla, nephew of former railway minister Pawan Kumar Bansal, on May 3 for accepting a part payment of the bribe amount of Rs 90 lakh by Kumar's associates to transfer him from Member (Staff), Railway Board to Member (Electrical) Board.
It was alleged that Singla wanted Rs 10 crore to get Kumar shifted. The CBI would name Kumar, Singla and Manjunath, a Bangalore-based railway equipment supplier who had arranged for the bribe money.
Bansal, reports said, might not be named as an accused in the first chargesheet, which might be filed after July 3. However, the CBI is likely to continue the probe and in case it finds proof showing involvement of more persons in connection with the case, they might be booked in the future.
Bansal had said after Singla's arrest that he had no knowledge about his nephew's dealings.