The Union Pacific pioneered transcontinental rail service. Eventually, running
freight through half of America meant long consists hauled by some of the
largest locomotives ever built. Reaching back to the end of the steam era,
Union Pacific pictures giants ranging from mainline Union Pacific 4-8-8-4
Big Boys and Challenger 4-6-6-4s, to the Class FEF-2 4-8-4 Northern, and a
remarkable T-57 4-6-0 ten-wheeler built in 1890. Steam on!