Top 20 Countries With the Largest Metro Subway Networks in the World

Top 20 Countries With the Largest Metro Subway Networks in the World ********************************* 0:00 - Which countries have the largest metro network? 0:41 - Which is the largest metro world? 1:11 - Which country has the best metro system in the world? 2:12 - What is the largest metro city? 3:11 - What are the 4 metro cities? 4:15 - Which is the second largest metro in the world? ***********************************