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.
View project
Coos Bay Rail Tunnel Rehabilitation
Rehabilitation and rock-lining repair of six miles of historic single-track rail tunnel in basalt.
Condition assessment, design and construction phase services for a 1920s-era rail tunnel.
A combination of mapped distress, remote inspection and roped-access verification supported a prioritised repair programme delivered inside short possession windows, minimising impact on freight operations.
Scope of work
- Tunnel Inspection & Rehabilitation
- Tunnels & Underground Engineering
- Geohazards
Project facts
- Length
- 6 miles
- Built
- 1920s
- Method
- Roped access
- Completion
- 2016
More transportation projects
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.
View project
TransportationSydney Metro City & Southwest
Metro-scale station caverns and twin running tunnels on Australia’s largest urban rail programme.
View project
TransportationCaldecott Improvement Project
A four-bore highway tunnel through the Oakland Hills, including a 3.5-mile bore and seismic retrofit.
View project
TransportationSR 99 Alaskan Way Viaduct Replacement
A four-lane, four-block downtown viaduct built as a structurally independent tunnel beneath a working street.
View project
TransportationHarpers Ferry Tunnel
Emergency stabilisation and permanent rehabilitation of a historic rail tunnel.
View project
Planning something underground?
Every project starts with a conversation about your ground, your constraints, and your programme.