Panaji: Former scam-busting Comptroller and Auditor General (CAG) Vinod Rai has been roped in by the Indian Railways to evolve a transparency mechanism for the functioning of the ministry and its operations, reports IANS. “I have asked our former CAG Vinod Rai, whose integrity is well respected by all. I have requested him to come and guide us on ways and means to make railway functioning transparent,” Prabhu said.