Hello,
Almost everywhere in Slovenia has wonderful scenery as backdrop for train photographs. I regularly travel from Pragersko to Ljubljana, and love the area south of Zidani Most following the river valley.
Unfortunately only one steam locomotive is in operation at the present, but it is the big Borsig 2-8-2, so well worth seeing! I like modern locomotives also, so have plenty to photograph. Also of course are interesting trains in surrounding countries.