5 Largest Metro Networks in the World

4. Seoul Metro, Korea

Insider Monkey Score: 317

Seoul Metro runs as an epitome of Korea’s hi-tech infrastructure, aspiring many urban transit planners across the globe. Since its birth in 1974, it has evolved substantially into a network consisting of 9 lines, covering 500 miles distance with 288 stations, catering to the city’s staggering population of 10 million! Reportedly, 70% of Seoul’s population is known to be commuting through the metro every day, not only because of the extensive scale of the network, but also because of its astonishing maintenance of cleanliness and efficiency.