Big Boy Steam Engine 4004

See one of the world's largest steam locomotives.

The Big Boy Steam Engine 4004 is the world's largest steam locomotive. This retired train features a coal-fired engine. It was designed to pull a 3600-ton train over steep grades between Cheyenne, Wyoming, and Ogden, Utah. There are 8 Big Boys remaining in the country.

The engine was built in 1941, designed for use by the Union Pacific Railroad. It weighs 1,208,750 pounds and its length is 132 feet. The total fuel capacity is 28 tons with the water capacity of 25,000 gallons. After its final run traveling from Cheyenne to Laramie in 1958, the engine was stored for a few years and eventually was donated to the city of Cheyenne. It is a beautiful piece of technology and locomotive history.

The engine is on display year-round in the southeast corner of Holliday Park in Cheyenne, Wyoming. There is a parking lot nearby and viewing the engine is free of charge. As you walk around, you can read various signs explaining the history of the engine. You can also take a rest on the benches if you want. This is a great place to take memorable photos with friends and family.