Just to inform you, if you are a really extreme European train modeler, that there are many ways to model and to run European trains in O gauge (3-rail ''coarse'' scale) and in O scale (real scale in Continental Europe 1:45). Here are the possible options which can be combined on your European layout:
1. tinplate and vintage toy trains (Hachette, Paya, Merkur, Hornby, etc.) [seen in toy museums]
2. low budget train models from the 1980ies (Lima, Rivarossi) [look in old catalogs]
3. downloaded STL files, probably re-scaled, 3D printed and assembled train models, examples...
a. Swedish electric locomotive https://www.thingiverse.com/thing:2274141
b. Russian electric locomotive https://www.thingiverse.com/thing:567332
c. Dutch freight car https://www.thingiverse.com/thing:1609559
d. German electric locomotive https://www.thingiverse.com/thing:2004062
4. high quality train models (Lenz, Kiss, Demko, MTH) [visit their web sites]
5. design yourself in 3D CAD (I use OpenSCAD www.openscad.org) the bodyshell of your preferred model of exported or license-built U.S./Canadian diesel locomotives, such as ALCo, GM-EMD, GE, MLW, etc., which have operated or still are operating on the European continent. For the motorization just use ready robust mechanism from MTH (RailKing or Premier). In other words: you can play European model railroading with American motive power. Here is a list of possibilities for your inspiration...
a. hood diesels and switchers
ALCO RSD-1 (Russia)
ALCO DL-532B/RS-8 (Greece)
ALCo DL-535S (Spain)
ALCo DL-543 (Greece)
ALCo RSC-3 (Portugal)
GE UM-10B (Spain & Greece)
GM GL-12CU (Spain)
GM G-16 (Spain, Slovenia, Croatia, Serbia, etc.)
GM G-22U (Slovenia)
MLW MX-620 (Portugal)
MLW MX-626 (Serbia)
MLW MX-627 (Greece)
MLW MX-636 (Greece)
b. heavy end-cab diesels
ALCo DL-500A (Spain)
ALCo DL-500C (Spain & Greece)
ALCo DL-500S (Spain)
GM ME class 1501-1531 EMD 16-645E3B (Denmark)
GM NOHAB (originally in Sweden, Norway and Denmark, later also other regions)
GM J-16CW (Spain)
GM J-16CW-AC (Spain)
GM MZ-1 / JT-26CW (Denmark & Spain)
GM J-26CW-SS/HEP (Spain)
MLW MXS-627 (Portugal)
Probably there are much more examples, but I got tired to list them down. Any way, to conclude, you don't need always to buy ready-to-run and off-the-shelf models to run European trains and certainly you don't need always Alpine nor Central European theme. Mediterranean or Scandinavian does it just fine.