shares of norfolk southern corp nsc slid 057 to 23966 tuesday on what proved to be an allaround poor trading session for the stock market with the sp 500 index spx falling 063 to 413215 and dow jones industrial average djia falling 067 to 3299012 the stocks fall snapped a threeday winning streak norfolk southern corp closed 5954 short of its 52week high 29920 which the company reached on december 31st the stock demonstrated a mixed performance when compared to some of its competitors tuesday as union pacific corp unp fell 122 to 21978 canadian national railway co cni fell 025 to 11378 and csx corp csx fell 081 to 3179 trading volume 25 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