Largest Steam Locomotives

Mountain Man

Active Member
The largest American steam locomotives were trhe Big Boy 4-8-8-4 and the Challenger 4-6-6-4's, but I briefly saw a mention of a larger class with three sets of main drivers, making it something like a 4-6-6-6-4. Was there such an engine?
 

Triplex

Active Member
So as you see, the Triplexes weren't super-huge, because the third set of drivers was under the tender. That's one of the limitations of Whyte notation: it assumes the tender is irrelevant.
 

bigsteel

Call me Mr.Tinkertrain
actually the C&O had alot of powerful engines.there 0-10-0 i read was the most powerful switcher EVER made.that is some power right there.and there 2-6-6-2's with flying pumps were also famous.C&O is my favorite line of all time!!
 
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