DESCRIPTION
In the years '90s Porto municipality decided to reduce the heavy congestion of road traffic introducing a new transit network (Metro do Porto, light metro system). Metro do Porto is similar to premetro/stadtbahn systems, combining underground sections through the city centre and ground level segments obtained by the conversion to metro opetration of some elder metric gauge local railways.
Metro do Porto first line (Line A) opened in 2002 (Senhor de Matosinhos-Trindade) and it was extended in 2004 (Trindade-Estadio do Dragao).
The second metro line (Line B) opened in 2005 (Senhora da Hora-Pedras Rubras) and it was extended in 2006 (Pedras Rubras-Povoa de Varzim).
Line C opened in 2005 (Fonte do Cuco-Forum Maia) and was extended in 2006 (Forum Maia-ISMAI).
Line D opened in 2005 (Polo Universitario-Camara de Gaia, Camara de Gaia-Joao de Deus) and it was extended in 2006 (Polo Universitario-Hospital Sao Joao), 2008 (Joao de Deus-D. Joao II) and 2011 (D. Joao II-Santo Ovídio).
Line E opened in 2006 (Verdes-Aeroporto); Line F opened in 2011 (Estadio do Dragao-Fanzeres).
Lines A, B, E and F share part of their tracks (Senhora de Hora-Estadio do Dragao); relevant network interchange points are located af Trinidade stop (served by Lines A, B, D, E, F) and Sao Bento stop (railway station, served by Line B).