The HŽ 6 112 009 seen between Mrzlo Polje and Karlovac centar

Karlovac itself lays well outisde the station so most S-Bahn trains run to Duga Resa, so that Karlovac Centar can be taken as a stop. This is a Zagreb regional train (multiple units going only to Karlovac are designated commuter and have a blue stripe).