ViaQuatro has successfully begun full operation of São Paulo’s entire Metro Line 4 with Siemens Mobility’s Communications-Based Train Control signaling. Since its first stretch opened in 2010, it has been the first fully automated metro line in South America that can operate with GoA 4, the highest grade of automation that allows trains to be automatically controlled and operated. The digitalized and optimized system allows for a more efficient and centralized control of operations, while also increasing the safety, availability, and capacity across the entire network.Also known as “the Yellow Line,” Line 4 will be able to carry up to one million passengers per day. Originating at the main railway station “Estação da Luz” and recently extended until “Vila Sônia,” the line spreads over 15 km, using a fleet of 29 trains to connect 11 stations. The line is operated by ViaQuatro, one of the companies of CCR Mobilidade, the division responsible for all urban mobility projects of the CCR Group in Brazil.Siemens Mobility has been a technology provider for CCR Mobilidade for many years. This includes recent projects for signaling and electrification of the metropolitan Lines 8 and 9 in São Paulo, as well as advanced technology for two surface Metro Lines (GoA2) in Salvador, Bahia.The Siemens Mobility CBTC solution Trainguard MT is the most extensively deployed automatic train control system in the world and is used by many operators, including Paris, Beijing, New York, London, Hong Kong, and Buenos Aires.