Where the project numbers stand.
The Suburban Rail Loop East (SRL East) — a 26km underground orbital rail line linking Cheltenham to Box Hill via Clayton, Monash, Glen Waverley and Burwood — remains Victoria's largest active infrastructure project and its most politically contested. Cost, funding and value are all live arguments; construction is unambiguously underway.
SRL East is the first stage of a longer-term concept for an orbital rail loop around Melbourne. Six new underground stations, twin-bore tunnels, and integration with the existing Metro Trains network at Cheltenham (Frankston line) and Box Hill (Belgrave/Lilydale lines). Trains would run at 3–5 minute peak frequencies with an end-to-end journey time of 22 minutes.
The project is planned to open in 2035. Tunnel-boring machine excavation is progressing at the Clayton and Burwood sites. Station-box excavation is well underway at multiple locations, and traffic diversions across the alignment are now a permanent feature of local road networks.
Original 2018 estimates put SRL East at $50bn. The state's 2023 Business and Investment Case increased that to $30–34bn for SRL East alone (with SRL North estimated at a further $16–20bn and SRL Airport at $10bn+). Independent scrutiny — including from the Commonwealth Parliamentary Budget Office and the Victorian Auditor-General — has raised concerns that the state's business case did not fully account for optimism bias, and that a total programme cost above $100bn is plausible.
The funding mix is contentious. The state has committed roughly one-third; the Commonwealth's contribution has been finalised at $2.2bn for SRL East (well short of the $11.5bn the state sought); and the remaining third is to come from "value capture" — land tax uplifts and precinct-based charges in the six station catchments. That value-capture assumption is the single biggest risk to the funding envelope.
Each of the six SRL East precincts has a draft structure plan aiming for significant residential density and commercial uplift, particularly at Monash, Glen Waverley and Box Hill. The precinct plans are the primary mechanism for value capture — higher floor-space ratios in exchange for infrastructure contributions.
Community consultation on precinct planning has been mixed. Box Hill traders have raised construction-disruption concerns; Glen Waverley residents have contested proposed building heights; Monash's university-adjacent precinct has generally welcomed the density.
Labor is committed to SRL East and views it as a signature legacy project. The Coalition under Brad Battin has softened from a 2022 "cancel" position to a "review" commitment, reflecting the reality that tunnel boring machines are in the ground and contracts run into billions. The Greens support integrated public transport but have consistently argued for reinvestment in the metropolitan bus network first.
The Commonwealth infrastructure review's next update, the Auditor-General's follow-up SRL report, and the outcome of the November state election. Whatever the political result, the technical reality is that SRL East is now too far advanced to abandon without significant sunk cost — the debate is about scope, precincts and future stages.