BUZZ-Federal Signal Corp: Biggest ever intraday pct loss
** Street sweeper and vacuum truck maker's shares down 21.4 pct at $11.89, stock the second-biggest loser on the NYSE
** Stock slips as much as 23.1 pct to over two-year low of $11.63, its biggest ever intraday percentage loss
** Forecasts lower-than-expected 2016 profit as downturn in oil and gas market is expected to result in reduced demand for its products
** Federal Signal also agrees to acquire Joe Johnson Equipment for initial consideration of C$108 mln
** More than 666,000 shares traded hands as of 1:04 p.m. ET, about 3.8x 25-day moving avg
** Up to Friday's close, stock had fallen 9.1 pct in the past 12 months
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