The Railway Board member is also under CBI scanner for alleged corruption in a separate enquiry related to purchase of coaches for the Kolkata Metro.
The sources said clarification was sought from him on the allegations that he nurtured vendor cartels at Level II in RDSO which wanted to stop contractors from upgrading from Level I to Level II to maintain its monopoly in bagging contracts.
They said Kul Bhushan was also asked about his relations with a renowned builder who allegedly got several relaxations from him in connection with development project of Rail Land Development Authority prime land at Sarai Rohilla here.
He was also questioned about his alleged association with several vendors who were eyeing lucrative railway signalling factory contract proposed in Chandigarh which was to be developed on public private partnership model.
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