Dec 14 (Reuters) - Canadian National Railway Co CNR.TO :
* CN AND UNIFOR REACH TENTATIVE AGREEMENT
* CANADIAN NATIONAL RAILWAY CO - NO DETAILS OF TENTATIVE AGREEMENT WILL BE RELEASED PUBLICLY
* CANADIAN NATIONAL RAILWAY - UNIFOR REPRESENTS ABOUT 2,100 LOCOMOTIVE, FREIGHT-CAR MECHANICS, ELECTRICIANS AND APPRENTICES WHO WORK AT CO ACROSS CANADA