Line 4 (Yellow) (Portuguese: Linha 4–Amarela) is one of the six lines that make up the São Paulo Metro and one of the thirteen lines that make up the São Paulo Metropolitan Rail Transportation Network. Originally called Southeast-Southwest Line, the line goes from Vila Sônia to Luz and currently has 11 stations along its 12.8 km (8.0 mi) and transports around 800,000 users/day. It is the most modern subway line in Latin America and the first line in the region to utilize driverless trains and platform screen doors in all stations.
The construction of the line was divided into two phases: The phase one was completed in 2011 and the phase two was partially inaugurated between 2014 and 2018 and was fully completed by 2021.
