The São Paulo Metrô , commonly called the Metrô, is the main rapid transit system in the city of São Paulo and the largest in Brazil. It is also the second largest system in South America and the third largest in Latin America, behind the Mexico City Metro and the Santiago Metro. The five main lines in the metro system system (Lines 1, 2, 3, 4 & 5) operate on of route, serving 65 stations. A sixth line, Line 15, is a monorail line that partially opened for service in 2014. In 2014, the four lines operated by CMSP (Lines 1, 2, 3 & 5) achieved an average weekday ridership of 3.09 million, and provided 895.6 million rides over the course of 2014; the entire Metro system served 1,098 million passengers when Line 4 is included with the other four lines.