As many as four PSUs are set to see off their top brasses today. S K Srivastava, the incumbent CMD of Oil India Ltd; Rupak Dayal, the incumbent Director (Pers) Western Coalfields Ltd; D C Arya, the incumbent Director (Finance) of Indian Railway Finance Corporation and T N Veeraraghavan, the incumbent Director (Engineering, R&D) BHEL are superannuating today.