São Paulo is moving ahead with one of its most anticipated transit projects: the extension of Metro Line 4–Yellow beyond Vila Sônia to Taboão da Serra, a dense neighboring municipality. The plan covers 3.3 km of track, two new stations—Chácara do Jockey and Taboão da Serra—six trains, and a new power substation. The total cost is about R$3.9 billion ($720 million), with R$2.98 billion ($552 million) coming directly from the state. The west side of São Paulo is one of the city’s busiest transport corridors, where thousands rely on crowded buses to connect to the rail system. São Paulo Metro Extension Aims to Boost Access and EfficiencyExtending Line 4 cuts transfer times, shortens journeys, and brings Taboão da Serra’s population directly into the metro network.