Mernda Line Extension — Did It Actually Fix Anything for Melbourne's North?
Back in 2018, when the Andrews Government opened the Mernda line extension, there was a real sense of occasion up in Melbourne's north. After years of watching the rest of the city get train upgrades, the communities around Doreen, Mernda and South Morang finally had proper rail access. Politicians were photographed grinning on platforms. Locals were — rightly — relieved.
But here we are, several years later. The new stations have been open long enough for the novelty to wear off, and it's worth asking the slightly awkward follow-up question: did the extension actually fix the problem it set out to solve?
The short answer is yes — partly. The more interesting answer is complicated.
What was actually built
Trains began running on the 8km extension from South Morang to Mernda in August 2018, with three new state-of-the-art stations opened at Middle Gorge, Hawkstowe and Mernda. The $600 million project was delivered six months ahead of schedule, which, in the grand tradition of Melbourne infrastructure, is genuinely remarkable. Go on, enjoy that fact for a moment.
The stations themselves are quite lovely, actually. The design drew on traditional rural structures — homesteads and shearing sheds — using simple folded roofs and veranda-like structures to create something that felt connected to the landscape rather than plonked on top of it. Someone in the design team was actually thinking, which isn't always a given.
The extension was designed to cater for around 8,000 new passengers a day , connecting some of the fastest-growing communities in Victoria to the broader train network.
The north really, really needed this
To understand why the extension mattered so much, you have to understand just how intense the population growth in this corridor has been. The City of Whittlesea — including the suburbs of Thomastown, Mernda and Wollert — is one of the fastest growing regions in Australia, with its population projected to grow by 4.3% per year.
These are suburbs where thousands of families moved, bought houses and set up lives — often with the implicit promise that infrastructure would follow. For a long time it didn't. Doreen and Mernda were basically transit deserts with good coffee shops. The extension was, at minimum, the government finally keeping a promise that had been made (implicitly or otherwise) when those residential estates were approved.
But here's where it gets complicated
The extension solved one problem — the end of the line — while leaving a bunch of other problems largely untouched.
The most fundamental constraint on the Mernda line has never been where it terminates. It's been the shared bottleneck at the city end. The capacity of the Mernda line is governed by constraints on the Hurstbridge line, because the two services share the same track between Flinders Street and Clifton Hill. That's two lines, squeezed down one corridor into the city.
What this means in practice is that even during peak hours, Mernda line services only run with headways of up to 7.5 minutes, dropping to every 10 to 30 minutes off-peak. For a corridor serving this much population growth, that's not enough. Frequency is always where the network falls short.
There's also the patronage story, which is a bit sobering. Despite the extension opening and the area continuing to grow, the northern corridor experienced a 19.2% decline in patronage from 2018–19 to 2024–25 compared to pre-pandemic levels. Some of that is COVID hangover. Some of it reflects the disruptions caused by level crossing removal works, which dumped passengers onto replacement buses repeatedly over recent years. But some of it, honestly, is probably just that the train isn't frequent or fast enough to win people back from their cars.
What still needs to happen
The extension was always supposed to be a first step, not a destination (no pun intended). Proposed extensions beyond Mernda to Wollert — estimated at $300 million — would push the line further into Melbourne's growth corridors , an area that is going to keep adding residents whether the trains follow or not.
More urgently, a second metro tunnel — Metro Tunnel 2 — has been proposed to connect the Mernda line through to a new cross-city route, mitigating the Clifton Hill bottleneck that caps how many trains can actually run. As of 2025, that project remains in feasibility stages with no committed funding or construction timeline.
In other words: the north got its extension. It was the right call. But extensions without the underlying network capacity to support them only solve part of the problem. Mernda residents now have a platform to stand on. What they're still waiting for is a train that comes often enough to actually change how they get around.
That's the real unfinished business of Melbourne's north.
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