When the métro opened 60 years ago it was among the least expensive to build. Now, the Blue Line extension is among the world's costliest. On the surface, high-tech methods employed to build the latest extension of Montreal’s métro system seem revolutionary. A tunnel-boring machine that stands three storeys, or 12 metres high, rotates at a rate of five turns per minute to dig roughly 15... [7014 chars]
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