Detailed Engineering for Shafts, Galleries, and Tunnels, Section B, Line 7

Detailed Engineering for Shafts, Galleries, and Tunnels The contract for Stage A included the development of detailed engineering for the shaft projects, both for stations and construction, galleries, and tunnels for Line 7, Section B, including six stations: Matucana, Cumming, Cal y Canto, Baquedano, Pedro de Valdivia, and Isidora Goyenechea. It also includes nine construction shafts and three ventilation shafts, the development of detailed engineering for the extension of the Line 6 interstation tunnel, the development of civil works projects for station platforms, mezzanine bridges, tunnel and gallery foundations, and the complete design of civil works and finishes for the rectifier substation premises and freight dispatch center building.