Union Pacific Big Boy  

The Big Boy has never pulled a train even half that long. In fact no single locomotive could pull a train anywhere near that long. Aside from the fact train length and weight vary greatly based on car type and whether they are loaded or empty, the simple fact is the limiting factor is the strength of the draft gear and the volume of air the locomotive can produce.

Omaha Nebraska.

The Yellowstone was a 2-8-8-4 that had a locomotive length of just over 83'. The Big Boy was a 4-8-8-4 with a length of just over 85'. So no, the Yellowstone was definitely not larger by length or axles.

@@FFred-us9tw I have to disagree. The big boy may be longer by 2' but the Yellowstone weighed more. Yellowstone Weight: 624 short tons Manufacturer: Baldwin Locomotive Works Big Boy Weight: 604 short tons Manufacturer: ALCO

​@@johnmajane3731 The info you got was from a site that has very poor info. It's not accurate at all (I know the site you read this because you quoted it directly). Here are the facts, direct from the manufacturer and RR specs using the largest versions of each series: Big Boy stats: Loco length: 85'4. With tender: 132'10. Axles: 12. Weight: 772,000 Lbs. With tender: 1,208,750 Lbs. Yellowstone stats: Loco length: 83'3. With tender: 132'9. Axles: 11. Weight: 627,00 Lbs. With tender: 1,010,700 Lbs. This is why the Big Boy is and has never been questioned as to why it holds the title of Worlds Largest.

@@FFred-us9tw more then one sight has the stats. Both are large locomotives and very close in weight and horsepower. The Big Boy has more horsepower and is 2' longer. They Yellowstone weighed more. Both were very successful for their time.

Well done chap!

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