The National Railway Network has approximately 2562km composed by lines and extensions in exploration, 1633 km of lines and extensions electrified (2015 census). It has more than 500 stations, between those Penalva Railway Station, which tunnel is located near to its, it is a railway interfaced in South Line, that serves Freguesia de Quinta do Anjo, in Concelho de Palmela, in Portugal.

CJC developed the detailed project, including earth moving, retaining, excavations, structures and installations, besides author’s supervisions of Penalva tunnel for Zagope Constructor.