Investors gained Rs 16 lakh crore in just two trading sessions as the Sensex rose over 3,000 points, driven by optimism following the NDA's victory in the Maharashtra elections. PSU stocks, particularly those linked to capex, saw the biggest gains, with RITES up 11%. PSU banks, led by Central Bank, surged 8%, while construction stocks like J.Kumar Infraprojects soared 16%.