Harrachov, Czechia
Adorf (Vogtland), Germany
Černousy, Czechia
Selb-Plößberg, Germany
Holzhau, Germany
Bayerisch Eisenstein, Germany
On the smallest branch lines in Germany and Czechia (and even just into Poland on one line) you will find them - Stadler RS1 railbuses, with their characteristic trapezoid shaped windows. Built between 1996 and 2013