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 O-19 0-6-0"): Canadian National Railway (CN) Class O-19 steam locomotives were of 0-6-0 wheel arrangement in the Whyte notation, or " C " in UIC classification.
Relevant evidence: No