Who We Are

Who We Are

We are a worldwide leader in tunnel design and engineering and our firm can look at a history of over 170 miles of successfully completed international tunneling projects.

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East Side Access

East Side Access

East Side Access is one of the most complex, ongoing metropolitan transportation projects in the US, located in the heart of Manhattan, New York. For the past decade, GZ has been involved in this endeavor rendering design and construction management services.

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Devil’s Slide Tunnel

Devil’s Slide Tunnel

GZ provided Integrated On-Site Team (IOST) support services for engineering and construction of two tunnels bypassing a stretch of California highway US 1 that is notorious for landslides.

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Crossrail

Crossrail

GZ provided expertise in design preparation incorporating sprayed concrete linings (SCL) for this project’s five London underground stations: Liverpool Street, Whitechapel, Bond Street, Tottenham Court Road and Farringdon.

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Featured Project

Caldecott Tunnel Fourth Bore Project

Caldecott Tunnel Fourth Bore Project

Contra Costa Transportation Authority / CALTRANS Caldecott Tunnel Improvement Construction Management Services: The existing Caldecott Tunnel consists of three two-lane … Read more »

Most Recent

See All News Silver Line Update: Work Begins on Loudoun Gateway Metro Station

Silver Line Update: Work Begins on Loudoun Gateway Metro Station

The second phase of Silver Line has been going on since 2014. This week crews will start working on the … Read more »

Most Recent

See All News WTC 2016

WTC 2016

At this year’s World Tunnel Congress (WTC) in San Fransisco, Gall Zeidler Consultants is participating in various ways.  Vojtech Gall … Read more »

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