shares of norfolk southern corp nsc slid 047 to 22807 monday on what proved to be an allaround dismal trading session for the stock market with the sp 500 index spx falling 075 to 387198 and dow jones industrial average djia falling 039 to 3273295 the stocks fall snapped a sixday winning streak norfolk southern corp closed 7113 below its 52week high 29920 which the company reached on december 31st despite its losses the stock outperformed some of its competitors monday as union pacific corp unp fell 076 to 19714 canadian national railway co cni fell 055 to 11844 and csx corp csx fell 055 to 2906true trading volume 18 m eclipsed its 50day average volume of 14 m editors note this story was autogenerated by automated insights an automation technology provider using data from dow jones and factset see our market data terms of use