TOP 20 Most Dangerous Train Routes on Earth | 4K Travel Documentary

Explore the world’s most dangerous railways in this 4K Travel Documentary. Discover extreme train routes built across towering mountains, deep valleys, salt lakes, deserts, and fragile bridges, where impossible engineering battles harsh terrain and the forces of nature. 📌 See more:    • Hanging Above the Abyss | World’s Most Ext...   📌 View the playlist:    • Dangerous Places | 4K Travel Documentary   #4ktraveldocumentary #impossibleplaces #traveldocumentary #railwayengineering #extremetravel #LandwasserViaduct #GoteikViaduct