Circle Line (MRT) Stage 6, Singapore

Completed in July 2026, Circle Line Stage 6 is the final phase of Singapore’s Circle Line, adding three underground stations, Keppel, Cantonment and Prince Edward Road, to close the loop between HarbourFront and Marina Bay. Set as deep as 20 metres beneath the city’s southern edge, the trio threads through the historic waterfront district and opens up access to the emerging Greater Southern Waterfront. Each station carries a considered material language from platform to street, its landscaped grounds, stone-lined concourses and daylit entrances shaped for decades of heavy civic use. Together they complete one of the world’s longest driverless metro loops, and set a refined new benchmark for what everyday transit infrastructure can look like.

Project type: Urban Development
Products used: Trench grates
Location: Singapore
Year: 2026
Architects: RDC Architects

Drainage that disappears into the landscape

At Keppel, the deepest and most landscaped of the three stations, Jonite’s trench grates thread through the concourse and across the entrance thresholds where the open landscape meets the sheltered interior. Set into the aggregate pathways that cross the station’s planted grounds, they gather rainwater and surface run-off before it can pool or track indoors, working hardest at exactly the points of heaviest footfall. Cast from reinforced engineered stone, the grates carry substantial pedestrian loads without deflection, resist staining from tracked-in grit and rain, and hold a naturally slip-resistant surface underfoot in every weather. Their custom colour and texture were matched to the surrounding paving and planting, so each run sits flush with the walkway and reads as a continuation of the ground rather than a channel laid over it. Seen from a few steps away, the drainage all but vanishes, leaving the landscape, and not the hardware, in view.

Custom Bathroom Grates | Cantonment Station

One engineered stone, across the whole loop

Every grate across the three stations, trench and bathroom alike, is cast from Jonite’s reinforced engineered stone, a material developed for precisely this kind of setting: civic infrastructure that must endure decades of relentless use and still look considered. Made from 95% natural aggregates and reinforced with a steel frame, it pairs the load-bearing strength these stations demand with the finish, colour and texture flexibility of a fully designed product. It is naturally slip-resistant, stain-resistant and corrosion-resistant, and stays easy to maintain over a long service life, with sustainability built into the material from the ground up. For three stations meant to serve Singapore’s southern corridor for generations, it is drainage designed to age as gracefully as the architecture around it.