This is the world's largest metro system with 508 stations.
It spans around 669 km and serves over 10 million daily passengers.
It is also the oldest metro system with over 5 million daily commuters.
It covers a route length of 607 km and a daily ridership of around 8 million.
The world's fifth-longest metro system has a route length of 399 km.
Established in 2002, Delhi Metro has UN certification for reducing carbon emissions.
7th largest metro system has 236 stations and covers roughly 397 km.
It has 228 stations and operates as both an underground and elevated rapid route.
It has also secured a spot on the list with its extensive network of 315 stations.
It is 293 km long, with 302 stations, 529 elevators, and 1,705 escalators.