Simplify the following text for a Grade 7 native English-speaking person.
Original: The line includes the Tanggula Pass , at 5,072 m ( 16,640 feet ) above sea level the world 's highest rail track and Tanggula Railway Station which is the highest railway station .
Simplified: The line includes the Tanggula Pass , which , at 5,072 m ( 16,640 feet ) above sea level , is the world 's highest rail track .