According to Union Pacific, eight Big Boy engines remain in existence, but only No. 4014 continues to operate. The seven ...

Union Pacific is dropping new hints this week of a coast-to-coast journey for its historic locomotive nicknamed ‘Big Boy’ ...

Big Boy is 133 feet long and weighs 1.2 million pounds, requiring a “hinged” frame to help it get around curves.

Union Pacific Railroad's iconic Big Boy No. 4014, the world’s largest operating steam locomotive, will journey between Wyoming and Colorado later this month. The limited excursion will offer rail fans ...

GREELEY, Colo. — The world's largest steam engine is back in Colorado. Union Pacific will bring Big Boy No. 4014 to Greeley from Tuesday to Wednesday, as part of a limited autumn excursion. The tour ...

Jennifer McRae is a digital media producer for CBS Colorado with more than 25 years of experience in news. Jennifer is part of the digital team recognized for excellence for Best Website several times ...