Emergency exit points
The route for the Forrestfield-Airport Link includes 8km of twin-bored tunnels, with safe entry and exit points via underground stations at Belmont and Airport Central. Trains will enter the underground rail line via tunnel portals at Bayswater and Forrestfield.
Given the length of the tunnels, additional infrastructure is required between the stations to allow safe egress to the ground level in the event of an emergency, and access to the tunnels for maintenance. As such, 12 cross passages and three emergency egress shafts will be built along the alignment.
The cross passages are located at numerous points along the route to provide a connection between the tunnels. In the unlikely event of an emergency, passengers will be able to exit the train and use the tunnel walkways to locate the nearest cross passage. They will then be able to enter the adjacent tunnel safely and exit through the nearest emergency egress shaft, station or dive structure.
Cross passages are constructed using the jet grouting process, a construction technique used to improve ground conditions and stabilise soils in preparation for tunnelling works.
Emergency egress shafts
Emergency egress shafts provide emergency exit points for passengers along the tunnel alignment. In the event of an incident, commuters will access the emergency egress shafts using the cross passages and walkways within the tunnel. They will then be able to use either the stairs or the lift contained within the emergency egress shaft to reach ground level emergency muster point.
Emergency egress shafts will be built in three locations along the alignment:
- Wright Crescent, Bayswater
- Woods Road, within the Terminal 3 & Terminal 4 Precinct
- Abernethy Road, Forrestfield