And if mp15ac is right about Terry C's reason for being interested, WHY NOT? I like the looks of BIG GE locomotives, but if I were building a model railroad I think I'd feel shortline/branchline railroading with lots of switching was more interesting to look at than the high-speed mainline freights the big GE's are best at! And, as any imaginative model railroader can tell you, THERE'S A PROTOTYPE FOR EVERYTHING!
In the late 1970's (I think-- may have been the very early 1980s) a coal mine in China wanted some heavy but not particularly powerful locomotives. GE rebuilt three retired E-L U33C with 1800 hp Cummins engines for them. ... As it happens, these units were to be radio controlled, and had their cabs removed (and the radiator compartment was rebuilt to something more like a U30 configuration, without the "wingspan"), but I've often fantasized about the possibility of a similar rebuild, retaining the cab (and so most of the original appearance), to make a good heavy switcher (or local freight roadswitcher) out of a retired B36-7. .... Come to think of it, CSX has a large B36-7 fleet that is approaching retirement, and their neighbor NS is feeling short enough of roadswitchers to have started rebuilding GP-50 as "GP-38-3", so it MIGHT even happen!