With 508 stations, this metro system is the biggest in the world.
With a length of over 669 km, it serves more than 10 million passengers every day.
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.
Delhi Metro was certified by the UN in 2002 for lowering carbon emissions.
Spanning around 367 km, the seventh largest metro system comprises 236 stops.
It has 228 stations and operates as both an underground and elevated rapid route.
With its vast network of 315 stations, it has also managed to gain a spot on the list.
It is 293 km long, with 302 stations, 529 elevators and 1,705 escalators.