John Work Garrett (July 31, 1820 – September 26, 1884), was an American merchant turned banker who became president of the Baltimore and Ohio Railroad (B&O) in 1858 and led the railroad for nearly three decades. The B&O became one of the most important American railroads by the time Garrett died, and Garret would also become a noted philanthropist. He provided crucial support for the Union cause during the Civil War, expanded the railroad to reach Chicago, Illinois, and competed with the Pennsylvania Railroad for access to New York City. -- Wikipedia
Garrett's desided loyalty to the Union during the Civil War proved crucial. Here he is (in the wide brimmed hat) at Union headquarters during the Battle of Antietam.
And here he is wearing the same hat in the same spot on the same day with Abraham Lincoln and George B. McClellan.
Garrett with Lincoln and McClellan