Sydney Metro Southwest Opens: 66km Line Links 31 Stations

Sydney Metro Southwest has begun passenger services, completing a 66km metro line that links the city's northwest, its central business district and the southwest across 31 stations.

The opening merges the M1 North West line with the City and Southwest sections into a single route. It delivers high-frequency metro services to Sydney's southwest for the first time, cuts journey times and gives passengers direct cross-city connections without interchange.

Alstom supplied the rolling stock, signalling and maintenance muscle behind the new section. Its scope covered the installation of the Urbalis communications-based train control (CBTC) system plus the provision and upkeep of Metropolis metro trains.

What did the brownfield conversion involve?

The Southwest extension runs along a 130-year-old railway corridor, with ten stations upgraded during the project. Engineers adapted legacy heavy-rail infrastructure for metro operation while retaining the stations' heritage features — a conversion that dictated much of the signalling and station work.

The CBTC deployment on the Southwest section is Alstom's second brownfield installation of the technology on an existing Australian railway corridor. The company previously delivered a comparable CBTC retrofit for Melbourne's Metro Tunnel project. For signalling engineers, that track record matters: brownfield CBTC is harder than greenfield, because you're fitting moving-block control onto infrastructure that was never designed for it.

How long has Alstom been on this job?

Alstom's Sydney Metro involvement runs back more than a decade. After the Northwest line opened in May 2019, the company won a contract that same year to supply 23 additional six-car Metropolis trains and Urbalis signalling technology for the City and Southwest extensions.

That contract covered project management, design, manufacturing, testing and commissioning. Alstom also maintains the metro fleet at Metro Trains Sydney's Tallawong depot, keeping the supplier embedded in day-to-day operations rather than handing over and walking away.

For operators, the practical outcomes are straightforward: CBTC permits the tight headways that make high-frequency metro service viable, and a single maintained fleet standard at Tallawong simplifies upkeep across the now-unified 31-station line.

What the supplier said

Guillaume Tritter, Managing Director of Alstom Australia and New Zealand, framed the opening as a partnership achievement:

"The journey to Sydney Metro Southwest passenger service has been built on deep partnership, trust and the commitment of people across Alstom and our partners across Sydney Metro, Metro Trains Sydney, NRT Corporation and MTR."

He added: "The opening of Sydney Metro Southwest, powered by our global technology, expertise and local knowhow, is an historic moment in Sydney's passenger transport history. We take great pride in the contribution of our teams to this moment and the positive impact on people, communities and industry that the opening of Sydney Metro Southwest will have for years to come."

Tritter's statement is a supplier claim, but the underlying facts support the scale: a 66km integrated line, 31 stations, 23 additional trainsets delivered since 2019 and a second brownfield CBTC deployment in the country all check out against the project record.

The opening completes another stage in Sydney's metro network expansion, with the merged North West–City–Southwest line now forming the backbone of the city's rapid-transit map.