Metro systems around the globe started to operate in the late 1800s and transfer millions of people across cities daily. There are now around 178 metro systems globally, with an average of 168 million daily passengers.

London Underground

Initially opened in 1863 for locomotives, it started to operate in 1890 and became the world's first metro system. It is the world’s third longest metro system, spanning 402km with 270 stations across its 11 lines. The network handles approximately five million passengers a day, with as many as 540 trains operating throughout the network at peak times.

Budapest metro

Line 1 of the Budapest metro, Hungary, began to operate on 1 of May in 1896. It is the world's oldest electrified underground railway system, and the second oldest underground railway system with multiple stations, after the originally steam-powered London Underground.

Glasgow Subway

Glasgow Subway in Scotland is the world’s third oldest metro system, opening in December 1896. The system carries approximately 13 million passengers every year. It features an outer and inner circle, with services operating the same route in separate tunnels clockwise in the outer circle and anti-clockwise in the inner circle.

Have you been to any of them?