TransportationCentral Subway
A 3.1-mile underground extension of the Market Street subway, delivering twin bored tunnels, three underground stations and a cavern beneath an operating city centre.
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Tunnel and underground projects, built and still standing.
Twenty-seven selected projects across four markets. Filter by market, or search for a project by name, location or service.
8 projects in Transportation
TransportationCentral Subway project details
TransportationNorthgate Link Extension
A 4.4-mile light rail extension including two cut-and-cover stations, a cut-and-cover crossover and 2.5 miles of underground guideway.
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TransportationSydney Metro City & Southwest
Metro-scale station caverns and twin running tunnels on Australia’s largest urban rail programme.
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TransportationCaldecott Improvement Project
A four-bore highway tunnel through the Oakland Hills, including a 3.5-mile bore and seismic retrofit.
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TransportationSR 99 Alaskan Way Viaduct Replacement
A four-lane, four-block downtown viaduct built as a structurally independent tunnel beneath a working street.
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TransportationCoos Bay Rail Tunnel Rehabilitation
Rehabilitation and rock-lining repair of six miles of historic single-track rail tunnel in basalt.
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TransportationHarpers Ferry Tunnel
Emergency stabilisation and permanent rehabilitation of a historic rail tunnel.
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TransportationSeattle Climate Pledge Arena Tunnel
Pedestrian and service tunnels delivering a new arena beneath a dense downtown block.
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