shares of csx corp csx shed 199 to 3601 monday on what proved to be an allaround grim trading session for the stock market with the sp 500 index spx falling 091 to 466897 and dow jones industrial average djia falling 089 to 3565095 csx corp closed 134 short of its 52week high 3735 which the company achieved on december 7th the stock demonstrated a mixed performance when compared to some of its competitors monday as union pacific corp unp fell 109 to 24574 canadian national railway co cni fell 311 to 12542 and norfolk southern corp nsc fell 174 to 28449 trading volume 144 m eclipsed its 50day average volume of 122 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