map- Panama Metro Line 3 (map El Metro de Panama)

Deutsche Bahn Berlin S-Bahn S21 (Deutsche Bahn Berlin S-Bahn S21 youtube project video)

Ferrovial PR High Speed Train (Ferrovial PR)

LTA CRL1 Tampines North station (LTA)

LTA CRL1 Defu station (LTA)

Qatar Main Drainage Tunnel by Ashghal

Túnel del Toyo (Túnel Guillermo Gaviria Echeverri) from INVÍAS

Hundvåg tunnel (Photo:Statens vegvesen)

BFK Danube Tunnel  (BFK)

Oslo's E6 Rentvannstunnel Project (water tunnel project) Norway City of Oslo drawing.