Union Pacific Challenger No. 3985 Steam Locomotive

The Challenger No. 3985 came through Bonner Springs, Ks this morning on the way to Union Station in Kansas City Mo. and I was there to photograph it.
Union Pacific Challenger No. 3985 was designed by Union Pacific and built in 1943 by the American Locomotive Company. It is one of 105 Challengers built for Union Pacific between 1936 and 1943 and is the only operating engine of its class in the world today – the largest and most powerful operating steam locomotive.
See more history and specs on the Challenger 3985