Image shows the tunnel.

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 big tape measures. How big does a subway tunnel need … Continue reading Twin tunnels, single bores and megabores – Local subway planners face choices on what will work best for new lines

In black and white, the image shows a long tunnel section.

The art and science of building subway tunnels – One size doesn’t fit all

In the dark, all subways tunnels can look alike, but each one is unique. Some are bored and others are mined. The length of a line and the geography of the neighbourhoods it goes through influences how a tunnel is created. A whole series of decisions about each tunnel must be made before construction can begin. This article sheds some light on the choices that … Continue reading The art and science of building subway tunnels – One size doesn’t fit all

Photo of the Scarborough Rapid Transit line in a station

Scarborough Subway Extension update- Two more steps taken toward better transit

The new three-stop Scarborough Subway Extension is now two steps closer to construction. The first stage in the bidding process closed in May, and on July 10, Metrolinx released an updated environmental project report that is a key part of moving the project forward. As progress marches on, this article explores how people living in – and connecting through – Scarborough are that much closer … Continue reading Scarborough Subway Extension update- Two more steps taken toward better transit

Image shows a long, deep tunnel.

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 the tunneling work on the two Toronto transit projects. The … Continue reading Tunnelling work on Scarborough Subway Extension and Eglinton Crosstown West Extension put out for bids

Image shows the Scarborough Subway Extension route.

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 other substantial project benefits noted in both reports, such as: … Continue reading Metrolinx releases updated business cases for Scarborough Subway Extension and Eglinton Crosstown West Extension

A drilling truck - about as big as a fire truck - sits beside a roadway.

Rock of ages – How drilling work on four Toronto subway projects are tapping into a subterranean GTA history, centuries in the making

While seemingly just a part of needed exploratory and preparatory work on subway routes, the bore holes speak to ancient movements of the Earth, as well as sleuthing faced by experts. To build a modern subway route, sometimes you have to dig back to the Ice Age. Field work for four major subway projects – the Ontario Line, the Yonge North Subway Extension, the Eglinton … Continue reading Rock of ages – How drilling work on four Toronto subway projects are tapping into a subterranean GTA history, centuries in the making