Besides, winding up of positions by participants on the last session of February's expiry in the derivatives segment, hit the trading sentiments, brokers said.
Stocks of cement, coal and steel companies suffered losses following hike in railway freight rates by up to 10 per cent.
With Railway Minister Suresh Prabhu sparing passengers from any hike in fares, market was abuzz with speculation that the Union Budget to be presented on Saturday will have a populist tilt, brokers added.
Today's drop is the biggest daily fall for the Sensex since the 490.52-point crash on February 9.
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On similar lines, the NSE index Nifty slipped below the crucial 8,700-level by falling 83.40 points, or 0.95 per cent to close at 8,683.85. Intra-day, it shuttled between 8,669.45 and 8,786.05.
Major losers were Texmaco Rail (-2.51 per cent), Kalindee Rail Nirman (-4.05 per cent), Stone India (-7.01 per cent), Simplex Castings (-4.26 per cent) and BEML (-1.65 per cent).
Stocks of cement firms such as ACC, Ultratech and Ambuja cement slipped following freight hike announcement.
Among the 30-Sensex constituents, 24 ended lower, five closed higher, while Hero MotoCorp closed unchanged.
Meanwhile, foreigners bought shares worth Rs 516.06 crore yesterday, and domestic institutional investors bought shares worth a net Rs 19.60 crore yesterday, as per provisional data.
Among sectoral indices, Auto, IT, Capital Goods, Healthcare, FMCG, Metal, Consumer Durables and Power fell up to 1.43 per cent. The Smallcap and Midcap indices also ended in negative territory zone.