Union Pacific's steam locomotive #3985 is the largest operating steam locomotive in the world. This 4-6-6-4 locomotive, built in 1943 still runs today as part of the railroad's public relations ...

Union Pacifics steam locomotive 3985 is the largest operating steam locomotive in the world This 4664 locomotive built in 1943 still runs today as part of the railroads public relations program In ...

Union Pacific’s Challenger No. 3985, which enjoyed a 30-year second life as a rolling railroad steam ambassador, will visit North Platte under tow for the last time over Veterans Day weekend.

MASON CITY — Quick, now. What weighs a million pounds and can travel at 70 miles an hour? The answer: The world’s largest operating steam engine, and North Iowans got a chance to see it Thursday and ...