Twin tunnels, single bores and megabores – Local subway planners face choices on what will work best for new lines

Each new subway tunnel is as unique as its surrounding neighbourhood and geology. While six-metre, twin tunnels were once considered standard, more recent technology has made larger, single tunnels possible. This article reviews the different sizes of tunnels and the factors that go into choosing one. Let’s get out the tape measures - the really … Continue reading Twin tunnels, single bores and megabores – Local subway planners face choices on what will work best for new lines

Tunnelling work on Scarborough Subway Extension and Eglinton Crosstown West Extension put out for bids

Today's (March 10) announcement represents important phase in the future deep work that will be needed on both Toronto transit projects. Metrolinx and Infrastructure Ontario have announced an important milestone for the Scarborough Subway and Eglinton Crosstown West extensions. An RFQ – a term meaning ‘request for qualifications’ – is now being put out for … Continue reading Tunnelling work on Scarborough Subway Extension and Eglinton Crosstown West Extension put out for bids

Metrolinx releases updated business cases for Scarborough Subway Extension and Eglinton Crosstown West Extension

New documents outline benefits for thousands of travellers moving around the GTA. Metrolinx has released updated business cases for the Scarborough Subway Extension and Eglinton Crosstown West Extension. The business cases show how both projects will provide significant benefits for regular commutes and special journeys by cutting travel times and expanding passenger capacity. There are … Continue reading Metrolinx releases updated business cases for Scarborough Subway Extension and Eglinton Crosstown West Extension