shares of norfolk southern corp nsc slid 210 to 21958 tuesday on what proved to be an allaround poor trading session for the stock market with the sp 500 index spx falling 042 to 449938 and dow jones industrial average djia falling 045 to 3531449 this was the stocks fifth consecutive day of losses norfolk southern corp closed 4464 short of its 52week high 26422 which the company achieved on august 26th the stock underperformed when compared to some of its competitors tuesday as union pacific corp unp fell 047 to 22863 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