young active hiker rests on a rest area and reads a book overlooking the kalte rinne viaduct in styria, northeastern austria

architecture austria austrian bahn book breitenstein bridge caucasian construction curved education engineer engineering europe hike infrastructure kalte literature lower machine mountain nature niedersterreich outdoor polleroswand rail railroad railway range rax raxalpe reading relaxing resting rinne schneeberg semmering semmeringbahn steiermark styria tourism tourist train transport transportation tunnel unesco valley viaduct