Abergeldie was engaged by Transport for NSW (TfNSW) to construct Chalmers Street Substation within the Prince Alfred Sidings Precinct, east of Central Station. The new substation forms part of the Power Supply Upgrade Program, which is designed to meet expected power requirements for Sydney’s future rail network and new fleet of air-conditioned trains.

Chalmers Street Substation currently provides 1500V traction power for all suburban lines from Central Station to Wynyard Station, City Circle and the Eastern Suburbs Line, as well as power to  signalling locations. Chalmers Street will also supply 11kV distribution power for Central Station and all stations around the City Circle and the Eastern Suburbs Line currently connected to the existing Prince Alfred Substation. The new facility is three x 5MW rectifier 33kV substation with twenty-seven DC circuit breakers. This provides support to the 1500V traction power supply in the area, so that it can sustain the additional train services and air-conditioned train loadings, improving network reliability and maintainability.


The heritage listed Prince Alfred Substation was one of the original substations in the Sydney Trains Network. The substation was designed by John Job Crew Bradfield and built in 1926. Linked to the substation at the Sydney Harbour Bridge, The Prince Alfred Substation and switching house formed part of the 1926–1932 electrification works for Sydney’s suburban lines and

Due to the great significance of this substation, it was highly important to avoid damage to buried remnants of heritage structures. Excavations for building footings and aligning high voltage cables needed to be planned and executed with absolute accuracy to take into account the large numbers of buried service lines and heritage structures.

The new substation was constructed close to the existing live operating rail system, in a densely developed part of the inner city, and had to be fully integrated with new system interfaces to existing electrical, telecommunications and civil infrastructure and installations. The project has been successfully delivered in accordance with TfNSW Standard Requirements (TSRs), relevant ASA and Building Code of Australia (BCA).

Management of the project required close communication and integration with the community, environmental, heritage, light rail,
and client stakeholders.

Abergeldie also constructed Granville Junction Substation which forms part of the Power Supply Upgrade Program. 


Transport for NSW

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