New high speed rail loop would link 9 European cities

The head of the U.K.’s leading architecture body has unveiled a radical vision for a vast circular city linking Britain and Ireland through a single high‑speed rail network.

Newsweek contacted the British Department for Transport via phone call and email for comment on the proposal.

Why It Matters

The proposal reimagines how major cities across the British Isles could be connected, challenging decades of fragmented transport planning. 

It also lands as the British government renews its commitment to large‑scale rail investment in the north of England.

What To Know

Royal Institute of British Architects (RIBA) President Chris Williamson has revealed plans for a “single, connected” circular city known as the Loop, stretching across northern England, Scotland and Ireland and bound together by a high‑speed rail line.

The proposal would link nine cities—Dublin, Belfast, Glasgow, Edinburgh, Newcastle, Leeds, Manchester, Liverpool and the Welsh city of Bangor—into what he describes as a new global city that is “dispersed but connected.”

He describes this ambition as a single connected “northern powerhouse” city of about 10 million people to boost economic coordination and reduce travel times.

At the heart of the concept is an elevated rail system carrying 50‑metre‑long trains running every five minutes at speeds of up to 300 miles per hour, a design Williamson says would minimise disruption at ground level while dramatically cutting journey times.

Alongside the rail line, the Loop would be supported by what Williamson calls a “continuous infrastructure” corridor capable of gathering and redistributing energy from onshore and offshore wind, with small modular nuclear reactors placed at key nodes along the route.

Williamson said his vision had been shaped in part by his work on Saudi Arabia’s NEOM project, including the controversial 170‑kilometre‑long Line development. 

While acknowledging that influence, he argues the British Isles should be no less ambitious.

“Maybe I have been too influenced by the scale, the vision and the ambition of NEOM the Line in Saudi Arabia, having worked on the high-speed stations running alongside the 170km city for the last few years,” he told Architect’s Journal.

“But we in the British Isles should be equally ambitious about our future. At present, the government seems to expect each city to compete for the same investment funding, when we need to encourage connectivity and collaboration.”

Williamson’s proposal arrives as the British government pushes ahead with the long‑promised £45 billion Northern Powerhouse Rail program, which will be delivered in phases starting with upgrades between the northern English cities of Sheffield and Leeds, Leeds and York, and Leeds and Bradford. 

Later stages are expected to include a new Liverpool‑to‑Manchester route via Manchester Airport, as well as improved trans‑Pennine links.

Williamson’s Loop is not the first attempt to imagine a connected northern megacity.

More than two decades ago, the late architect Will Alsop proposed a similarly ambitious—though more linear—vision under the last Labour government, with backing from then-Deputy Prime Minister John Prescott.

What People Are Saying

Discussing the scale of the proposal, Chris Williamson said: ‘The level of economic investment is significant, as are the potential benefits. Construction costs are estimated at £130 billion, with projected economic benefits of around £12 billion per year. From the stations, automated vehicles would serve the final leg of journeys, extending the reach of the system beyond the core network.

He added: “The inclusion of Dublin and Belfast would require progress on border arrangements and political cooperation. The project would also release capacity on existing surface transport networks, supporting reductions in road freight and contributing to wider carbon reduction objectives.”

What Happens Next

Williamson plans to formally present the Loop as part of this year’s Royal Academy summer exhibition in London, which is themed around “interconnectedness.” 

While the proposal has no official backing, it adds to growing pressure for more ambitious, joined‑up thinking on the future of transport and regional development in the United Kingdom.