Artist Unknown They “Keep ‘em Rolling” Poster printed for the Diamond Anniversary (1869-1944) 1944. the Union Pacific Railroad Company features a worker using a pneumatic wrench in the foreground. Behind him a crew of a dozen maintenance men ready a steam engine for service. Subtext informs us that the railroads are the backbone of offense. Viewers are told to listen to “Your America” on the Mutual radio station Sundays at 4:00 P.M. eastern wartime. 26×19 near mint, conservation backed.