shares of norfolk southern corp nsc shed 091 to 25581 monday on what proved to be an allaround dismal trading session for the stock market with the sp 500 index spx falling 169 to 441253 and dow jones industrial average djia falling 119 to 3430808 this was the stocks second consecutive day of losses norfolk southern corp closed 4339 short of its 52week high 29920 which the company achieved on december 31st the stock underperformed when compared to some of its competitors monday as union pacific corp unp rose 047 to 24311 canadian national railway co cni fell 019 to 12413 and csx corp csx fell 026 to 3424 trading volume 12 m remained 272219 below its 50day average volume of 15 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