BRIEF-Canada's TSB issues preliminary report on CN Rail derailment in Northern Ontario
Feb 23 (Reuters) - Canadian National Railway Co
* Report on derailment in northern Ontario
* Safety board says all derailed class 111 tank cars were constructed in the last 3 years
* Saftey board says at least 19 of the 29 tank cars were breached or partially breached Further company coverage: (Reporting By Euan Rocha)
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