shares of canadian national railway co cnr inched 083 higher to c15428 wednesday in what proved to be an allaround favorable trading session for the canadian market with the sptsx composite index gsptse rising 097 to 2007077 canadian national railway co closed c2111 below its 52week high c17539 which the company reached on december 13th trading volume of 12 m shares remained below its 50day average volume of 12 m