Ascending 16,000 feet above sea level, the Qinghai-Tibet Railway is the highest train line in the world. Marvel at the engineering solutions that completed a railway that traverses some of the tallest mountain ranges in the world and crosses a foundation of unstable permafrost to connect modern China to the Hidden Kingdom of Tibet. Includes glossary, websites, and bibliography for further reading. Perfect for STEM connections. Aligns to the Common Core State Standards for Language Arts. Teachers' Notes available online.