2.5 km long underground railway line in a double-tube underground track system for the North-East-Line (NEL) in Singapore with two stations, two underground passages and a flyover.

Railway tunnel provides a modern connection of Zaventem airport close to Brussels to the European high-speed railway system and to E 19 motorway.

Double-tube road tunnel under the Gent-Terneuzen Canal provides a new connection between the important ports of the Netherlands in the north and those of Flanders in the south.