shares of canadian national railway co cnr dropped 060 to c15301 tuesday in what proved to be an otherwise allaround positive trading session for the canadian market with the sptsx composite index gsptse rising 028 to 1987856 canadian national railway co closed c2238 short of its 52week high c17539 which the company reached on december 13th trading volume of 811057 shares remained below its 50day average volume of 12 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