shares of norfolk southern corp nsc slid 300 to 25788 friday on what proved to be an allaround poor trading session for the stock market with the sp 500 index spx falling 363 to 413193 and dow jones industrial average djia falling 277 to 3297721 the stocks fall snapped a twoday winning streak norfolk southern corp closed 4132 short of its 52week high 29920 which the company reached on december 31st the stock underperformed when compared to some of its competitors friday as union pacific corp unp fell 207 to 23429 canadian national railway co cni fell 292 to 11762 and csx corp csx fell 247 to 3434 trading volume 16 m eclipsed its 50day average volume of 16 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