The Indian equity benchmarks gained for third session in a row on Thursday as investor sentiment got a boost after the Reserve Bank of India held interest rates at record low and maintained its accommodative stance to foster economic growth for as long as possible. The Sensex rose as much as 594 points and Nifty 50 index touched an intraday high of 17,639.45. Rally in today's session was led by buying interest in index heavyweights like Infosys, HDFC Bank, HDFC, Kotak Mahindra Bank, State Bank of India and Tata Steel.