Big Boy No.4014 is the world's largest operating steam locomotive.
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They are here to see the Union Pacific's Big Boy.” It is a 1.1-million-pound steam locomotive that is the world's largest in operation. Visitors from Alaska, Pennsylvania and more have seen it during this Omaha trip for the Home Run Express Tour.
Therefore I say it was and is the largest steam engine that was ever created... There was a machine called the Allegheny type which I think was a 4-6-6-6 which some believe was actually more powerfull and heavier than the Big Boy.
Twenty-five Big Boys were built exclusively for Union Pacific Railroad, the first of which was delivered in 1941. Of the eight remaining Big Boys in existence, No.4014 is the only one operating today. The Big Boys were about 133 feet long and weigh 1.2 million pounds.
Alco PA LocomotivesArguably the most beautiful diesel locomotive ever built, sadly no Alco PAs were originally preserved. Today, one is under restoration.
On 3 July 1938, the A4 class locomotive Mallard raced down Stoke Bank at 126mph to set a new steam locomotive world speed record. That record still stands.
The Big Boys were built for power. They did the work of three smaller engines, pulling 120-car, 3800 ton freight trains at forty miles per hour in the mountains of Utah and Wyoming. With power, though, comes weight - larger cylinders, pistons, drive rods, boiler and firebox.
Hydrogen-powered fuel cells, combined with batteries to store electricity, would be a zero-emissions solution to replace the diesel-electric locomotive, Moslener says.