The Union Pacific Big Boy No. 4014 launched its "Heartland of America ... The tour includes whistle-stops and a public ...

Whistle stops in Colorado are scheduled ... Twenty-five Big Boy locomotives were built for Union Pacific, No. 4014 is the world’s only functioning Big Boy. Eight Big Boys remain throughout ...

There are steam locomotives, and then there’s “Big Boy.” At 604 tons and 132 feet long and with a 4-8-8-4-wheel arrangement, it is the largest, most powerful steam locomotive in the world.