As of 2006, you can take a 48-hr. ride between these 2 cities, with a stretch on the world's highest railroad
[DOC] [TLE] Free Flashcards about COUNTRIES - StudyStack [PAR] OF THE WORLD'S 4 LARGEST COUNTRIES IN AREA, IT HAS THE SMALLEST 
... AS OF 2006, YOU CAN TAKE A 48-HOUR RIDE BETWEEN THESE 2 CITIES, 
WITH A STRETCH ON THE WORLD'S HIGHEST RAILROAD, BEIJING & LHASA.