Not quite sure about that Nick, as there is some conflicting info regarding a couple of other engines. As I recall Norfolk & Western had a mighty big one, and so did one of the Iron Ore hauling lines up north in your neck of the woods. But I don't think the differences were much, and generally it is accepted that the Big Boy was number ONE. Many factors can be considered, such as total tonnage, or just weight on driving wheels, drawbar pull, cylinder bore size and operating pressure can all come into the equation.
Do you have any links to that huge traction engine?
The C & O - Chesapeake & Ohio 1601 Allegheny 2-6-6-6 was said to be 7500 HP. It has been on display at the Henry Ford Museum since it arrived under it's own power in 1956.
Gil
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