Benchmark equity indices Sensex and Nifty surged to their fresh record high levels in early trade on Thursday after the US Federal Reserve cut its benchmark interest rate after more than four years.The 30-share BSE Sensex jumped 735.95 points to scale a new all-time high of 83,684.18 in early trade.The NSE Nifty also surged 209.55 points to hit a fresh record peak of 25,587.10.