The Federal Government has released a 300-page business case outlining plans for a new 194-kilometre, $93 billion high-speed rail line linking Sydney and Newcastle. If delivered, it would become one of the largest infrastructure projects in Australia’s history.

However, the ambitious proposal is not without significant technical and financial challenges. As a result, some engineers and economists questioning whether the project is achievable in its current form.

So, what would the project involve — and what hurdles stand in the way?

Inside the proposed high-speed rail plan

Under the proposal, 200-metre high-speed trains would travel at up to 320 kilometres per hour, running every 20 minutes between 5am and 11pm. Operations are expected to begin in the late 2030s.
Travel time between Sydney and Newcastle would be reduced to around one hour. Meanwhile, trips between either city and the Central Coast could take approximately 30 minutes.

According to the government, areas of high growth will be prioritised during the project’s early stages. Government forecasting claims that 104,000 extra homes could be built along the rail’s proposed route once it is completed.

The business case estimates the project could deliver a $250 billion boost to the economy over the next 50 years. If approved, the project could be shovel-ready within two years.

The government will spend the next two years designing the tunnels and stations ahead of a final investment decision in 2028.

What are the challenges?

Complex underground works

One of the most significant challenges is the scale and complexity of the tunnelling required to deliver the project. It is estimated that up to 60 per cent of the 194-kilometre route could need to be constructed underground, at an unknown cost. Some engineers have suggested tunnelling could reach as much as $1 billion per kilometre.

The proposed third stage to Western Sydney International Airport is considered particularly high risk. The route may need to be tunnelled deeper to avoid existing power and communications infrastructure, as well as future fuel pipelines. Deeper tunnels increase not only construction costs but also engineering complexity. This includes ventilation requirements to ensure safe air quality for passengers.

Other construction challenges include access roads that will need to be built through national parks. This is to remove soil excavated during tunnelling.

Assessing long-term return on investment

Beyond the engineering hurdles, the project also presents significant financial considerations. Infrastructure of this scale relies on long-term demand forecasts and economic modelling. While many projects are assessed on a 30- or 50-year return, a rail asset of this nature is expected to operate for more than a century.

This makes calculating the long-term return on investment of this project more complex and sensitive to changing assumptions.

Experts say that many countries that have invested in high speed rail have seen significant benefits. However, these have not always been easy to calculate.

Projects of this scale highlight just how complex Australia’s infrastructure pipeline is becoming. From large-scale tunnelling and environmental planning through to risk management and procurement, major rail developments demand highly specialised skills across engineering, project management and construction trades.

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Article References

Forster, S (23 February 2026) ‘Federal government commits further $229.6 million for Sydney to Newcastle high-speed rail’, ABC News, accessed 2 March 2026.

Wiggins, J (25 February 2026) ‘$93b high-speed rail link forecast to hit headwinds’, Financial Review, accessed 2 March 2026.