They are the massive machines that will help build new subways in the GTHA. This week, Between the Lines: A Metrolinx Podcast digs into tunnel boring machines and how they work. Listen to the full episode below.

This week, the Metrolinx podcast team is going deep on the mechanical marvels that are tunnel boring machines (TBM).

Want to learn more about the podcast? Check out the new show landing page.

Host Matt Llewellyn speaks with Walter Trisi, director of construction for the Scarborough Subway Extension project. With Trisi’s decades of tunnelling experience on hand, the two chat about how a tunnel boring machine works, how using TBMs actually minimizes disruptions to the surface and how the Scarborough Subway Extension is making history in Ontario.

Stay tuned – and thank you! – Between The Lines: A Metrolinx Podcast

Thank you to all of our thousands of listeners who have joined us so far. The Between The Lines team will be taking a short break over the summer, but we will be back. We want to hear from you! What topics should we focus on? What Metrolinx projects do you want to learn more about? What are you liking about the podcast? What would you improve? Send us your thoughts: podcast@metrolinx.com Have a great summer. Stay tuned… Host: Matt Llewellyn (@mattrolinx) Producer/Social: James Wattie (@jameswattie) Learn more at blog.metrolinx.com Credits: Gregory David / Shifting Out / courtesy of http://www.epidemicsound.com — Send in a voice message: https://anchor.fm/metrolinx/message

1. Stay tuned – and thank you! 01:29
2. Episode 21 – Top 5 reasons customers get in touch with GO Transit customer service 20:35
3. Episode 20 – #AMAwithAMA – Terrifying near miss video, what are sun kinks and Pride Month begins 10:54
4. Episode 19 – Walking The Entire Eglinton Crosstown Line 20:18
5. Episode 18 – #AMAwithAMA – GO & UP service changes, rail safety and your transit questions answered 10:58

Do you have a question you’d like answered? Email the team at podcast@metrolinx.com.

Read more about the three TBMs currently in use by Metrolinx and how the public helped named them here.

Also, tunneling recently started on the Eglinton Crosstown West Extension – learn more here.

To learn more about the Scarborough Subway Extension, click here.

You can also watch how the Eglinton Crosstown LRT was tunneled below:

Story by James Wattie, producer/editor, Between the Lines: A Metrolinx Podcast