I have a few favorites, mostly unique models
In the way of steam, I'm tied at a combination of the Pennsy's K4 Pacifics, and unique T1 (4-4-4-4) Duplexes for Passenger power; For Freight (steam powered) I'm also tied hands down on the Pennsy's Q2 (4-4-6-4) Duplexes, the I1sa 2-10-0's, and M1b 4-8-2's for freight. Although I don't mind Baldwin built 2-8-0s...
For diesel power, I'm tied between Alco PA-PB sets, and Baldwin's unique DR6-4-20 2000 Horsepower Passenger Sharks for passenger power, with freight being held up by Baldwin Centipedes.







