view of the kalte rinne railway viaduct and a passing train in semmering, rax-schneeberg group, styria, austria

architecture austria austrian bahn breitenstein bridge construction curved engineer engineering europe heritage hike industry infrastructure kalte lower machine mountain nature niedersterreich outdoor polleroswand rail railroad railway range rax raxalpe raxschneeberg rinne schneeberg semmering semmeringbahn speed steiermark stone styria tourism tourist train transport transportation tunnel unesco valley viaduct