Question: Locomotives kept grand trunk lettering for service in the U.s on railroads such as this known as st-laurent et atlantique quebec? 
Sentence (from "Canadian National class N-4 2-8-0"): Canadian National Railway (CN) Class N-4 steam locomotives were of 2-8-0 wheel arrangement in the Whyte notation, or 1′D in UIC classification.
Relevant evidence: No