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

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

Union Pacific Railroad said Big Boy No. 4014 will return to the rails in a "big way" in honor of America's 250th anniversary ...

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