Big Boy No. 4014 and Lincoln Locomotive No. 1616 last week rode the rails together for the first time as part of a limited ...

DENVER (KDVR) — The world’s largest operating steam locomotive, known as Big Boy No. 4014, is coming back to Colorado — and this time, it’s bringing a friend. Union Pacific, a railroad ...

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 the United States.

Twenty-five Big Boys were built during World War II, but only eight survived. No. 4014 is the only one of the eight still in operation and remains the world’s largest operating steam locomotive. UP ...

Eight Big Boys remain throughout the United States. Big Boy No. 4005 is on display at the Forney Museum of Transportation in Denver. Big Boy No. 4004 is on display at Holliday Park in Cheyenne.