Some 9,000 precast tunnel liner rings and 523,000 cubic yards of concrete have been used to build Toronto's Yonge-University-Spadina subway extension, which runs a bit more than 5 miles. "There’s a lot of concrete down here. There’s more concrete [than] you could ever sort of believe," said Sam Spares, construction site manager. Work is expected to be finished this year, and then testing of systems and trains will begin.
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