There are a lot of articles regarding the subject of locomotive sizes, and I'll be real: most of them are wrong. There's a lot of assumptions when it comes to how big locomotives have been in the past, their size, their power, and everything else. So, here's a list of what, based on my own investigation, I believe to be the heaviest locomotives ever to run on the rails.

0:00 - Intro
1:40 - Union Pacific Big Boy
3:47 - The Yellowstones
6:01 - Chesapeake and Ohio class M-1
7:50 - Virginian Railway EL-3A
9:08 - Union Pacific GTEL Coal Burner

"The Union Pacific Big Boy is a type of simple articulated 4-8-8-4 steam locomotive manufactured by the American Locomotive Company (ALCO) between 1941 and 1944 and operated by the Union Pacific Railroad in revenue service until 1962. The 25 Big Boy locomotives were built to haul freight over the Wasatch Range between Ogden, Utah, and Green River, Wyoming. In the late 1940s, they were reassigned to Cheyenne, Wyoming, where they hauled freight over Sherman Hill to Laramie, Wyoming. They were the only locomotives to use a 4-8-8-4 wheel arrangement: four-wheel leading truck for stability entering curves, two sets of eight driving wheels and a four-wheel trailing truck to support the large firebox."

"A 2-8-8-4 steam locomotive, under the Whyte notation, has two leading wheels, two sets of eight driving wheels, and a four-wheel trailing truck. The type was generally named the Yellowstone, a name given it by the first owner, the Northern Pacific Railway, whose lines ran near Yellowstone National Park. Seventy-two Yellowstone-type locomotives were built for four U.S. railroads."

"The Chesapeake and Ohio class M-1 was a fleet of three steam turbine locomotives built by the Baldwin Locomotive Works for the Chesapeake and Ohio Railway in 1947–1948 for service on the Chessie streamliner. As diesel locomotives became more prevalent following World War II, the C&O was one of several railroads loath to abandon coal as a fuel source, and saw steam turbine technology as a possible alternative to diesel. At the time of its construction it was the longest single-unit locomotive in the world."

"Alco-Westinghouse EL3A electric locomotive built for the Virginian Railway in 1925."

"In October 1962, Union Pacific constructed an experimental GTEL of its own, using a modified ALCO PA-1 as a cab, the chassis of a GN W-1-class electric locomotive (bought for scrap from the Great Northern Railway) as the second unit, and a modified turbine prime mover removed from one of the 50 to 75 series locomotives."

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