shares of norfolk southern corp nsc slumped 001 to 20969 tuesday on what proved to be an allaround mixed trading session for the stock market with the sp 500 index spx rising 009 to 415487 and the dow jones industrial average djia falling 003 to 3397663 norfolk southern corp closed 6696 below its 52week high 27665 which the company achieved on april 21st despite its losses the stock outperformed some of its competitors tuesday as union pacific corp unp fell 028 to 19947 trading volume 13 m remained 514526 below its 50day average volume of 18 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