• RentlarOP
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    7 months ago

    Kinda. They are about the same speed, comparing the Scarborough Subway single TBM vs. the Eglinton Crosstown are both purpoted to travel 10m to 15m per day. Even if the speed of the smaller TBMs is a bit faster, the design of having one tunnel vs. two tunnels would be different. Costs of tunneling might vary greatly by project, accounting for each locations’ ground conditions and existing infrastructure to navigate around. So I concede that I could be wrong about the price in the general case when comparing 1 big vs. 2 small machines.