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tunneling

The identical twin TBMs weighed-in at 750 tons each and were affectionately named Mom Chung — for Dr. Margaret “Mom” Chung, the nation’s first Chinese-American physician — and Big Alma — for San Francisco philanthropist and socialist “Big Alma” de Bretteville Spreckles.

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Crossrail Engineers: Olivia Perkins - My day at Crossrail

Tunnel engineer Olivia Perkins gives a tour of Crossrail's Tottenham Court Road site and explains what it's like working on Europe's largest infrastructure project.To find out more about tunnel engineer Olivia Perkins, visit the #TeamCrossrail blog: http://crossrail.tumblr.com/post/1046...For more information about the Crossrail project visit:http://www.crossrail.co.uk/

Sound Transit's 2nd tunnel boring finished

Tunneling contractors will now focus on building 15 cross passages between the two tunnels. The overall $1.9 billion project is about halfway complete and scheduled to open in 2016.

S.F. MTA to award $233.5M subway contract

A construction approach called "deep tunneling" will be used to construct the Central Subway. Deep tunneling allows most of the work to be done below ground, reducing disruption on the surface by using the TBMs, a technology that has been used extensively throughout the world.

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