Question: Grand Trunk Western 6325 gained notoriety in 1946 for pulling  which United States President's successor's campaign train through Michigan?
Context: 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 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. The Grand Trunk Milwaukee Car Ferry Company was the Grand Trunk Western Railroad's subsidiary company operating its Lake Michigan railroad car ferry operations between Muskegon, Michigan, and Milwaukee, Wisconsin, from 1905 to 1978.  Major railroad companies in Michigan used rail ferry vessels to transport rail cars across Lake Michigan from Michigan's western shore to eastern Wisconsin to avoid rail traffic congestion in Chicago. The International (formerly International Limited) was a named passenger train operated between Chicago and Toronto.  It was originally an overnight train operated by the Grand Trunk Railway of Canada and its successors the Canadian National Railway and Grand Trunk Western Railroad, running as far as Montreal.  The train was cut back to Port Huron, Michigan in 1970 and discontinued in 1971. 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. SEMTA Commuter Rail, also known as the Silver Streak, was a commuter train operated by the Southeastern Michigan Transportation Authority (SEMTA) and the Grand Trunk Western Railroad between Detroit and Pontiac, Michigan.  It began in 1974 when SEMTA assumed control of the Grand Trunk's existing commuter trains over the route.  SEMTA discontinued operations in 1983.  Amtrak began offering intercity service between Detroit and Pontiac in 1994 as part of its Michigan Services. 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 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. Durand Union Station is a historic train station in Durand, Michigan.  The station, which now serves Amtrak "Blue Water" trains, was originally a busy Grand Trunk Western Railroad and Ann Arbor Railroad station, as well as a local office for Grand Trunk Western, from its construction in 1903 until 1974. Harry S. Truman (May 8, 1884December 26, 1972) was the 33rd President of the United States (1945–53), assuming that office upon the death of Franklin D. Roosevelt during the waning months of World War II.  He is known for launching the Marshall Plan to rebuild the economy of Western Europe, for leading the Cold War against Soviet and Chinese communism by establishing the Truman Doctrine and NATO, and for intervening in the Korean War.  In domestic affairs, he was a moderate Democrat whose liberal proposals were a continuation of Franklin Roosevelt's New Deal, but the conservative-dominated Congress blocked most of them.  He used the veto power 180 times, more than any president since then, and saw 12 overridden by Congress; only Grover Cleveland and Franklin D. Roosevelt used the veto so often, and only Gerald Ford and Andrew Johnson saw so many veto overrides.  He is also the only world leader to have ever used nuclear weapons in war, desegregated the U.S. Armed Forces, supported a newly independent Israel, and was a founder of the United Nations.
Answer: Franklin D. Roosevelt