Question: Locomotives kept grand trunk lettering for service in the U.s on railroads such as this known as st-laurent et atlantique quebec? 

Context paragraphs:
Grand Trunk Corporation: The Grand Trunk Corporation is the subsidiary holding company for the Canadian National Railway's properties in the United States.  It is named for CN subsidiary railroad Grand Trunk Western Railroad.  The Association of American Railroads has considered it to be a Class I railroad since fiscal year 2002.

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.  These locomotives were built for the Grand Trunk Railway (GT) from 1906 until GT began purchasing class S freight locomotives in 1913.  Class N-4 were built as Richmond compound locomotives with 210 lb/in2 boilers feeding 22+1/2 in and 35 in by 32 in cylinders; but most had been rebuilt as simple single expansion locomotives by GT.  The most satisfactory rebuilding method was designated sub-class N-4-a by CN, and lesser numbers of sub-classes N-4-b through N-4-f represent alternative rebuilding designs.  Both GT and CN took some of these rebuilding efforts out of their original numerical sequence.  CN numbered class N-4-a locomotives from 2525 through 2660 and numbered the alternative rebuilding classes from 2661 through 2686.  The rebuilt simplified locomotives remained in freight service until the final replacement of steam with diesel locomotives.

St. Lawrence and Atlantic Railroad: The St. Lawrence and Atlantic Railroad (reporting mark SLR) , known as St-Laurent et Atlantique Quebec (reporting mark SLQ) in Canada, is a short line railway operating between Portland, Maine, on the Atlantic Ocean and Montreal, Quebec, on the St. Lawrence River.  It crosses the Canada–US border at Norton, Vermont, and is owned by short line operator Genesee and Wyoming.

Canadian National class E-7 2-6-0: Canadian National Railway (CN) Class E-7 steam locomotives were of 2-6-0 wheel arrangement in the Whyte notation, or 1'C in UIC classification.  These locomotives were built for the Grand Trunk Railway (GT) from 1898 through 1908.  Some of the class had been built as compound locomotives with 200 lb/in2 boilers feeding 22.5 in and 35 in by 26 in cylinders; but all save one had been rebuilt as simple single expansion locomotives beginning in 1911.  GT began adding superheaters to these locomotives in 1913.  CN simplified the last compound and continued the superheating conversions, but some locomotives never received superheaters.  Most of the class were scrapped in the 1930s; but number 713 worked on the Berlin Subdivision branch to Lewiston, Maine until replaced by diesel locomotives in 1957, and was preserved in the Canadian National Museum train.

Grand Trunk Western 6325: Grand Trunk Western 6325 is a 4-8-4 (Northern) type steam locomotive built in 1942 by the American Locomotive Company for the Grand Trunk Western Railroad.  As a member of the dual service U-3-b class, the 6325 handled heavy passenger and freight work for the Grand Trunk Western.  In 1946, the 6325 gained notoriety for pulling United States President Harry S. Truman's election campaign train through the state of Michigan.  Retired in 1959, the locomotive was donated for display to the city of Battle Creek, Michigan where a failed restoration attempt left the 6325 in danger of being scrapped.  Purchased in 1993 by Jerry Jacobson of the Ohio Central Railroad, the locomotive sat in storage for six years until being restored to operating condition in 2001 for use on excursion trains across the Ohio Central System.  The locomotive is currently stored, out of service pending an overhaul at the Age of Steam Roundhouse in Sugarcreek, Ohio

Grand Trunk Railway Stations: Grand Trunk Railway Stations or Grand Trunk Railroad Stations may refer to former and active passenger rail stations built for the Grand Trunk Railway or its subsidiaries the Grand Trunk Western Railroad and the Grand Trunk Pacific Railway.

Grand Trunk Junction Railway: The Grand Trunk Junction Railway was a subsidiary of the Grand Trunk Railway that built a connecting line along 49th Street in Chicago, Illinois.  The company was incorporated on June 11, 1880, and opened on August 29, 1881 under lease to the Chicago and Grand Trunk Railway.  Its line was double-tracked and began at the Chicago and Grand Trunk's main line at Elsdon, heading east across the Columbus, Chicago and Indiana Central Railway and just south of the Union Stock Yards to a junction with the Chicago and Western Indiana Railroad, a terminal railroad that gave the Chicago and Grand Trunk access to downtown Chicago, and which the Grand Trunk Junction acquired a one-fifth interest in.  The Polk and Forty-ninth Streets Junction Railway, which did not construct any railroad, was incorporated on March 27 and merged into the Grand Trunk Junction on June 21, 1889.  On January 15, 1901, just after the Chicago and Grand Trunk was reorganized as the Grand Trunk Western Railway, the latter company bought the property of the Grand Trunk Junction.

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.  These USRA 0-6-0 locomotives were built for the Grand Trunk Railway (GT) in 1919 and remained in yard service until the final replacement of steam with diesel locomotives. ALCO builders numbers 60187 through 60191 were built at the Cooke plant as Grand Trunk Western Railroad numbers 1744 through 1748 while builders numbers 61298 through 61302 were built at the Schenectady, New York plant numbered 1824 through 1828 for use on New England lines.  The locomotives were renumbered from 7522 through 7531 under Canadian National control, but retained Grand Trunk lettering for service in the United States.

Grand Trunk Western Railroad: The Grand Trunk Western Railroad Company (reporting mark GTW) is an important American subsidiary of the Canadian National Railway (reporting mark CN) operating in Michigan, Illinois, Indiana and Ohio.  Since a corporate restructuring in 1971 the railroad has been under CN's subsidiary holding company the Grand Trunk Corporation.  Grand Trunk Western's routes are part of CN's Midwest Division.  Its primary mainline between Chicago, Illinois, and Port Huron, Michigan, serves as a connection between railroad interchanges in Chicago and rail lines in eastern Canada and the Northeastern United States.  The railroad's extensive trackage in Detroit and across southern Michigan has made it an essential link for the automotive industry as a hauler of parts and automobiles from manufacturing plants.

Grand Trunk Station (South Paris): The Grand Trunk Station was a historic railroad station in South Paris, Maine.  The station was built in 1883 by the Grand Trunk Railroad linking South Paris with Montreal and Portland, Maine.  Trains began regular operation between Portland and the depot on the Paris side of the town line with Oxford at Widow Merrill's crossing October 8, 1849, even though the station was listed as "North Oxford" in timetables.  The first train into South Paris village was a contractor's engine called the Jenny Lind on January 1, 1850.  It ran carefully across temporary bridgework up to where the station was being built, as a means of satisfying the investors worries from Paris Hill to counter their threat of withdrawing their support and money if there was not a train in the village proper on that date (an engine operating by itself without cars met the ruling of a train).  The Androscoggin bridge was completed March 15, 1850, with regular service to Portland from the present day station grounds to Portland beginning on the 18th.  On December 30, 1879, the Norway Branch Railroad opened, running from Norway village on a line 1.45 miles long to connect with the Grand Trunk Railroad at South Paris.

Supporting paragraphs: Canadian National class O-19 0-6-0 St. Lawrence and Atlantic Railroad
Answer: The St. Lawrence and Atlantic Railroad