Might have been mentioned before, but if you've ever wanted to model a prototypical yet eclectic railway system, Liberia has you covered. LAMCO alone operated vehicles built in/for the US, Britain, Germany, and Sweden for a wide range of loading gauges:
Images borrowed from here: https://www.derbysulzers.com/liberia.html and https://www.derbysulzers.com/liberia2.html
And these are just the ones I've found pictures of online. There were apparently quite a few other types from Sweden, and there appears to have been ALCo RS locomotives there at least during construction. Parts of the old LAMCO network seems to nowadays be operated by second hand Köf's (with some very nice home-built coaches), second hand Romanian diesels, and new-build GE ES44AC locos.