BG&E designed four concrete through-girder rail bridges and four rail overbridges for the Cronulla Rail Line. All bridges were constructed alongside existing rail tunnels and the utilisation of a staged construction approach allowed uninterrupted traffic flow throughout the project.

As part of the Rail Clearways Program, the two remaining single track sections on the Cronulla Rail Line were duplicated. The project included the upgrade and duplication of 14 kilometres of track, upgrade of two stations, reconfiguration of Cronulla yard, and resignalling of the branch line.

BG&E designed four concrete through-girder rail bridges. Each bridge consisted of a pair of precast post-tensioned I-girders with pre- tensioned deck formwork and an insitu deck slab to tie the precast units together and provide U-frame restraint to the I-girders – including bridges on significant skew.

We also designed four rail overbridges (tunnels) consisting of contiguous pile wall abutments with deck planks and an insitu deck slab to provide moment connection and full frame action – including tunnels on significant skew to the road above.

The project also involved

• Construction of an eight-lane stabling facility.
• Upgrade to the State Heritage Listed Cronulla Railway Station.
• Vegetation clearing to enable works.
• Installation of drainage structures.
• Installation of bridges and associated road and footpath pavement work.
• Pedestrian management and implementation.
• Protection and subsequent biodiversity offsets of Sydney Turpentine Ironbark Forest and River Flat Eucalypt Forest remnants.