世界十一大地鐵系統 11. Sao Paulo, Brazil

11. Sao Paulo, BrazilThe Sao Paulo Metro is the first underground transit system in Brazil. It works alongside a larger company called the Companhia Paulista de Trens Metropolitanos (CPTM) and together they cover 187 miles of track and transport approximately 3.7 million people daily. Highlights: Known as one of the cleanest and safest systems in the
world. Affordable fare.