Line A was in December 2002 the first opened of the Metro do Porto. From March 2005 it shared its route between Estádio do Dragão and Senhora da Hora with other lines making this the joint route. About 300 meter north of Senhora da Hora line A leaves the joint route and turns to the west in the direction of Matosinhos. This branch counts nine stops: Vasco da Gama – Estádio do Mar – Pedro Hispano – Parque Real – Câmara de Matosinhos – Matosinhos Sul – Brito Capelo . Mercado de Matosinhos – Senhor de Matosinhos. Until 1993 electric trams had been riding through Rua Brito Capelo, nine years later this street welcomed the trams of the MP.
7 December 2002 Trindade – Senhora da Hora – Senhor de Matosinhos (6.1 km from Trindade to Senhora da Hora and 5.7 km from Senhora da Hora to Senhor de Matosinhos)
6 June 2004 Estádio do Dragão – Trindade (3.8 km)
Travel time to Senhor de Matosinhos is 19′ from Senhora da Hora, 32′ from Trindade and 41′ from Estádio do Dragão.
Time-table (winter 2021/2022): every 15′, peak hours every 12′