shares of canadian national railway co cnr shed 238 to c15597 tuesday in what proved to be an allaround negative trading session for the canadian market with the sptsx composite index gsptse falling 163 to 1951290 this was the stocks third consecutive day of losses canadian national railway co closed c1551 below its 52week high c17148 which the company reached on march 29th trading volume of 840578 shares remained below its 50day average volume of 10 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