Identify the city in which has largest metro system in the world by the number of stations.
Identify the city which has one of the most complex transit systems in the world, serving the world's most populous city.
Identify the city which has the second busiest metro system in Europe.
Identify the city which boasts a surprisingly diverse transit system that includes a mix of commuter rail, rapid transit and trolleys, all of which make stops both above and below ground as they pass through the city center.
Identify the city which has a long-established underground network. Approximately 80% of the lines run underground.
Identify the city which has one of the most profitable metro systems in the world. It is generally considered to be the best in the world.
Identify the city which has world’s third longest metro system.