Equipment arrives for Broadway subway project (

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Ministry of Transportation and Infrastructure

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Tunnel-boring machine facts
  • Each tunnel-boring machine (TBM) is six metres wide, 150 metres long (about the length of a football field), and weighs nearly one million kilograms (or approximately 333 elephants).
  • The TBMs will each have a staff of eight to 12 controlling them and monitoring the operation’s vital signs.
  • The TBMs will bore approximately 18 metres of new tunnel per day.
  • The excavation of both tunnels will generate approximately 200,000 cubic metres of soil that will be removed through a conveyor system.
  • The tunnels will be approximately 15 metres below ground, down to a maximum of 20 metres at Broadway-City Hall Station.
  • Once the machines arrive at Cypress Street, they will be disassembled and removed through an excavation shaft.