shares of norfolk southern corp nsc shed 174 to 26225 tuesday on what proved to be an allaround rough trading session for the stock market with the sp 500 index spx falling 126 to 452512 and dow jones industrial average djia falling 080 to 3464118 norfolk southern corp closed 3695 short of its 52week high 29920 which the company achieved on december 31st the stock demonstrated a mixed performance when compared to some of its competitors tuesday as union pacific corp unp fell 218 to 25211 canadian national railway co cni fell 096 to 12887 and csx corp csx fell 095 to 3527 trading volume 18 m eclipsed its 50day average volume of 15 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