Line C or Green line, inaugurated in 2005, is one of the six metro lines in Porto and has 27 stations. It has approximately 24,3km length with a travel time of 43 minutes.

CJC developed the basic, detailed project and author’s supervision in Lapa tunnel, with the architectural and constructive conception, Trindade station, Bolhão station and Heroísmo station projects, including the basic project with architectural and constructive conception and author’s supervision in Bolhão station, also excavation and structures.

Source: https://pt.wikipedia.org/wiki/Linha_C_(Metro_do_Porto)