mumbai, Nov. 21 -- Optimism lit up the Street on Thursday as the Nifty touched a 13-month high, with index heavyweights surging as the US-trade deal appeared closer than ever before. Buying in large caps and derivatives short-covering may sustain the rally, experts said, even as caution prevails over how long the rally lasts. The Nifty pushed past 26,200 for the first time since its intraday lifetime peak of 26,277.35 on 27 September last year. Powered by HDFC Bank and Reliance Industries, the Nifty closed 0.54% higher at 26,192.15, near its record close of 26,216.05 on 26 September, 2024. The Sensex closed 0.52% higher at 85,632.68, a whisker away from its own peak of 85,836.12. HDFC Bank has a 12.78% weight in the Nifty while Reliance has...