Two of the most complex substation replacements on the TfNSW network ever: Chalmers Street and Granville Junction used 3D modelling and virtual reality to deliver solutions that will help millions of Sydney’s rail system users get around the city.

Transport for New South Wales (TfNSW)’s smart, new, air-conditioned trains provide a safe, secure and comfortable experience for the people of Sydney, and more trains are being introduced to the network each year.

As part of Power Supply Upgrade (PSU) works, Chalmers Street and Granville Junction Substations will play a key role in supplying the additional traction power demanded by the new trains.

We are providing a full suite of multidisciplinary engineering services – including full detailed design of the substations and their integration into the existing TfNSW network.

A number of complexities created challenges for the delivery team, including: Chalmers’ constrained site location next to Sydney’s Central Station; Granville’s notable distance from the existing substation it replaced; construction of other important infrastructure; the need to maintain power to critical network areas; construction staging; heritage considerations and the discovery of heritage artefacts; plus managing multiple stakeholders and users.

The innovative use of 3D modelling for both substations provided significant benefits. An integrated 3D model containing civil, structural, power, and building services infrastructure enabled us to optimise the design for high voltage and traction efficiency, constructability and maintainability. And the use of virtual reality for the first time on a project of this type and scale gave our client a valuable real-time experience of the design solution prior to construction.


1500V DC feeders


of users


total traction power capacity

Granville Substation 1500V DC switchboard.
The existing Prince Alfred Substation next to the new Chalmers St Substation.
Granville Junction Substation 3D model.
Chalmers St Substation 3D model.
Granville Substation cable basement.
Granville Substation 1500V DC switchboard.

Our Team Says

Without a doubt, these have been some of the most complex and rewarding projects I’ve worked on. Team collaboration, careful planning and design, communication and innovation proved a success on these projects.

Vai Rane

Principal - Power Engineering

Our People

Kevin Friesen

Principal - Power Systems Engineering

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Miron Janjic

Technical Fellow - Power

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