i am working on my UP fleet of different engines and i have thought about wanting to have the Alco-GE # 101 which was tested on UP tracks as X50 the only double head engine and one of the first turbines built and i found a large scale fourn and there is a comment about a modeler who had cut 2 Aristo A units and glued the cabs and bodies together the engine does look great but what i want to know what are the Aristo A units to me they look like a FTa and if my thinking is accurate
according to the photocopy of the blueprints that i have this engine is 83 feet and 71/2 inches long from cupler to cupler and i figure on a HO scale this unit would work fine with a 22" radius as far as the FA unit goes would that be a F3,F7 type? i did not think that alco made a FA unit without some type of series number
F3 & F7 are EMD model designations, not ALCo. The ALCo model designation is FA. There were four versions of the FA (FA-1, FA-2, FA-3 & FA-4), but for your purposes any one will do as the cab sections were all the same.
Model-wise there have been several productions, the LifeLike FA was probably the most accurate.