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| Linha 4-Yellow | |
|---|---|
| Name | Linha 4-Yellow |
| Native name | Linha 4-Amarela |
| Type | Rapid transit |
| System | São Paulo Metro |
| Status | Operational |
| Locale | São Paulo, Brazil |
| Start | Butantã |
| End | Vila Sônia |
| Stations | 11 |
| Owner | Companhia do Metropolitano de São Paulo |
| Operator | ViaQuatro |
| Character | Underground |
| Stock | Alstom Metropolis |
| Line length km | 12.8 |
| Electrification | 750 V DC third rail |
Linha 4-Yellow is a rapid transit line of the São Paulo Metro serving the city of São Paulo, Brazil. The line connects major nodes such as Butantã, Paulista Avenue, Pinheiros River, and Jabaquara corridor interchanges while providing links to Avenida Paulista, Ibirapuera Park, MASP, and the University of São Paulo via nearby stations. Conceived to relieve congestion on Line 1 (Blue), Line 2 (Green), and the CPTM suburban network, Linha 4-Yellow introduced private operation and new signaling technologies to the São Paulo rail system.
Linha 4-Yellow is an underground, medium-capacity corridor operated by ViaQuatro under a public-private partnership with the Companhia do Metropolitano de São Paulo. The line uses driverless-capable Alstom rolling stock and includes modern station architecture designed by firms and architects linked to projects like Fiesp, MASP, FAAP, and developments near Ibirapuera Park. Funding and contracts involved entities such as the Brazilian Development Bank, BNDES, Mitsubishi Heavy Industries, and construction consortia that previously worked on projects like Estádio do Morumbi and Cidade Universitária infrastructure.
Planning for the line began amid São Paulo expansion debates involving Luiz Inácio Lula da Silva administrations and São Paulo municipal authorities including Roberto Carlos-era plans and later administrations associated with figures such as José Serra and Fernando Haddad. Initial proposals referenced models used in systems like London Underground, Paris Métro, and Moscow Metro while contracting private operators inspired by arrangements in Hong Kong and Japan. Construction phases were executed by consortia including contractors with experience on projects such as Line 4 (Lisbon Metro) and partnered with suppliers like Siemens, Alstom, and ThyssenKrupp. Political negotiations involved the Ministry of Transport and municipal agencies analogous to discussions around Aeroporto de Guarulhos expansions.
The alignment runs east–west under corridors including Avenida Rebouças, Avenida Paulista, and the Pinheiros River valley, connecting neighborhoods like Butantã, Pinheiros, Cerqueira César, and Vila Madalena adjacency points. Key stations provide interchange with Line 1 (Blue) at Higienópolis–Mackenzie vicinity and connections to CPTM lines at Pinheiros and Luz-area planning, while stations are proximate to landmarks such as Museu de Arte de São Paulo (MASP), Instituto Moreira Salles, and Paulista Avenue cultural centers. Station design incorporates accessibility standards consistent with projects like Estação da Luz refurbishments and integrates with bus corridors similar to Rede Integrada de Transporte initiatives.
Operations are managed by ViaQuatro under contract with the metro company, employing signaling systems and operational models influenced by deployments on RER and METRORail networks. Service patterns include peak-frequency headways enabled by automatic train control from suppliers akin to Alstom and Siemens Mobility, and maintenance routines coordinated with agencies comparable to Company of Urban Transportation entities. Fare integration aligns with São Paulo fare policy set by the SPTrans and metropolitan authorities, facilitating transfers to CPTM suburban lines and municipal bus systems linked to Terminal Bandeira-style hubs.
Rolling stock consists of Alstom Metropolis trains equipped for automatic train operation, air conditioning, and CCTV systems similar to procurement programs for Line 3 (Red) upgrades. Infrastructure includes twin-bore tunnels, portal ventilation, and substations using 750 V DC third-rail electrification akin to systems in Singapore MRT and Hong Kong MTR. Maintenance facilities and depots were constructed with design input from firms that worked on projects like Linha 6 (Orange) preliminary studies and include trackwork compatible with standard gauge practices used across Brazilian metro networks.
Ridership levels reflect demand from commercial corridors such as Avenida Paulista and academic catchments like University of São Paulo, with peak loads compared to those on Line 1 (Blue) and intermodal flows to CPTM stations. Performance metrics are monitored by the metro company and municipal transport secretariats, with indicators informed by experiences from systems such as New York City Subway, Tokyo Metro, and Seoul Metropolitan Subway to improve punctuality, safety, and passenger information services.
Planned expansions and integration efforts have been discussed with stakeholders including the State Government of São Paulo, private financiers akin to BNDES collaborators, and urban planners referencing transit-oriented development examples from Barcelona, Copenhagen, and Vancouver. Proposals contemplate westward and eastward extensions to serve growth corridors near Vila Sônia, industrial zones, and connections to regional rail projects that mirror proposals for settlements around Guarulhos and metropolitan rail integration seen in cities like Buenos Aires.
Category:São Paulo Metro lines