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