shares of norfolk southern corp nsc slid 196 to 27042 friday on what proved to be an allaround mixed trading session for the stock market with the sp 500 index spx rising 052 to 450053 and the dow jones industrial average djia falling 006 to 3508974 this was the stocks second consecutive day of losses norfolk southern corp closed 2878 below its 52week high 29920 which the company achieved on december 31st the stock underperformed when compared to some of its competitors friday as union pacific corp unp fell 080 to 24239 canadian national railway co cni rose 005 to 12229 and csx corp csx fell 090 to 3430 trading volume 11 m remained 127279 below its 50day average volume of 13 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