Siemens to digitalize São Paulo Metro Line 4-Yellow extension, Brazil

Siemens Mobility has been selected by Motiva, the concessionaire operating São Paulo's Metro Line 4-Yellow, to equip the line's extension with its digital signalling technology, according to a Siemens press release dated 15 July 2026. The project will add 3.3 kilometres of double-track tunnels and two new stations — Chácara do Jockey and Taboão da Serra — extending the line to a total length of 16.1 kilometres. Taboão da Serra will become the first São Paulo Metro station located outside the city's own municipal limits.

Line 4-Yellow already operates as Latin America's first fully automated and driverless metro line, running at the highest grade of automation (GoA4) under Siemens Mobility's communications-based train control (CBTC) system. The extension will apply the same CBTC technology — Siemens' Trainguard MT system — to the new section, alongside electronic interlocking, telecommunications and operational supervision systems. Components will be sourced internationally: the interlocking system from Germany, the CBTC system from France, and parts of the telecommunications solution from Italy, with final integration carried out in Brazil. Six additional trains will be equipped with the CBTC system for the extended line.

The signalling and safety-certification work is scheduled to take around 59 months, following a contractual addendum to the Motiva concession reportedly worth R$676.8 million for this portion of the works. Once complete, the extension is expected to cut the journey time between Estação da Luz and Taboão da Serra to around 26 minutes, benefiting more than 280,000 residents of the Taboão da Serra region and serving an estimated 110,000 passengers a day.