STM unveils unique tunnel-boring machine for métro's Blue Line

The long-promised Blue Line métro extension will be built primarily by a tunnel-boring machine that is among the largest of its kind in the world. On Monday, the STM unveiled the machine, which arrived during the fall in more than 100 pieces and was assembled meticulously in the last months. Painted white with the métro system’s blue arrow surrounded by a circle, the machine was an impressive site, sitting about three storeys high and located about 20 metres below ground level at the future Vertières station on Jean-Talon St. in St-Léonard.