@Tom Tee posted:Additionally, concerning full scale sized articulated locomotives You may want to look at the Lionel USRA C&O 2-6-6-2. Overhang is minimal for an articulated yet it's proportions are decent, pulls good and is a smooth runner. I have 2 of these in two rail and it will just squeeze on a 24" TT with the two rail flanges and close coupling. In three rail it should fit on a 26" TT.
I just measured my USRA 2-6-6-2, and it's 25" long exclusive of couplers and 26" long with the couplers included in the measurement. I know it doesn't fit on my 24" TT.
However, it is a great puller, it's the one that is pulling my 54 car tank train, it handled it effortlessly, grades and all.