Equity benchmark Sensex rallied over 400 points in early trade on Wednesday and soared past the 54,000 mark, led by gains in index majors Infosys, HDFC and ICICI Bank amid a positive trend in global markets. After scaling its lifetime peak of 54,256.13 in opening trade, the 30-share index was trading 415.33 points or 0.77 per cent higher at 54,238.69 in initial deals.