Great Northern K-1
Just a quick and dirty copy of the stock Atlantic to have its real-world stats. The model is of the GN K-1, so I got looked it up on steamlocomotive.net (https://www.steamlocomotive.com/locobase.php?country=USA&wheel=4-4-2&railroad=gn#6944) and made this. There are two variations, the as-built compound version and the rebuilt superheated/simpled version. Stats here:
GN K1
Top speed: 80 mph
Power: 1418 hp (calculated using the ALCo estimtation formula from cylinder size and boiler pressure)
Tractive effort: 94 kN/21,000 lbf
Weight: 162t/356,000 lbs
Available: 1906-1951
GN K1s
Top speed: 90 mph
Power: 2534 hp
Tractive effort: 163 kN/36,000 lbf (including booster engine)
Weight: 180t/397,000 lbs
Available: 1924-1951
I have yet to find any information on how to calculate the power of a compound engine at all, so I just estimated using the same cylinder size as the simpled version.
Enjoy!