Rock Rail South Western’s new Arterio fleet will transform travel

Unveiled by South Western Railway’s Managing Director Mark Hopwood during a special event at Wimbledon depot, the name Arterio reflects the suburban network’s importance to the nation’s capital.

The UK’s busiest station, London Waterloo is at the heart of the South Western network and South Western Railway’s suburban routes are the arteries which feed it, taking people to work and school, to the capital’s theatres, restaurants and bars and home again.

The 90-strong fleet will replace some of the network’s oldest trains, and will offer better reliability and performance, delivering more passengers where they want to go, on time and in comfort.

Customers travelling on Arterio will experience more comfortable and connected journeys with two by two seating, onboard Wi-Fi, at-seat charging points, screens showing real-time service information, air-conditioning, walk-through carriages, dedicated wheelchair spaces and fully accessible toilets across the entire suburban network for the first time.

The first Arterio train is expected to be introduced later this year on the Reading line, with a total of 750 new carriages to be introduced over the following two years.

Rock Rail South Western, a joint venture between Rock Rail, Aberdeen Standard Investments and GLIL Infrastructure, financed the fleet and will lease it to South Western Railway (SWR).

Rail Minister Chris Heaton-Harris said:
“This is an important milestone for South Western Railway. This new fleet which will offer improved reliability and better facilities, getting passengers across the South West to their destination in comfort and on time.

“As services begin to return to normal levels and passenger numbers increase, it is our upmost priority to ensure everyone stays safe when travelling, which is why we continue to advise people to wear a face covering, travel at quieter times, wash their hands regularly and maintain social distancing.”

Mark Hopwood, South Western Railway’s Managing Director, said:
“The name Arterio reflects how important this fleet will be in carrying people in and out of the heart of the capital.

“Although passenger numbers may be low at the moment, people will want to travel again whether that is for work or leisure and we will be ready to play our part in helping that recovery. New trains that offer a transformed travelling experience will be key to that.

“The Arterio fleet is a massive investment for our business, and we are looking forward to our passengers joining us on this exciting journey.”

Mark Swindell, CEO Rock Rail and Director Rock Rail South Western, said:
“We are delighted that the new and aptly named Arterio fleet is set to deliver a vastly improved travelling experience for passengers returning to these key SWR routes into and out of London.

“The new fleet represents the largest single investment by pension funds and insurance companies into UK rolling stock, reflecting Rock Rail’s and our institutional partners’ commitment to sustainable travel and, working in partnership with SWR and Bombardier, to helping transform rail travel across the region.”

Matt Byrne, President UK & Ireland, Bombardier Transportation said:
“We are delighted that South Western Railway have chosen the name ‘Arterio’ for the 750-car fleet we have designed and are now building here in Britain.

“We are working with SWR to bring the trains into service as rapidly as possible, so they can help transform the vital routes serving London’s Waterloo Station.”

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Driving Net Zero: How Rock Road 
Is Funding the UK’s Bus Transition

Accelerating the shift to clean, affordable, zero-emission transport

Year
2025
Category
Rock Road
Share

The Challenge

The UK bus network is at the heart of everyday travel – but over 30,000 diesel buses still need replacing to achieve a fully zero-emission fleet.

While around 5,000 battery-electric buses are already on the road, the high upfront cost of electric vehicles and depot electrification continues to slow the transition. Traditional funding routes — such as government grants or short-term bank finance – have helped start the journey but cannot support decarbonisation at the scale required.

A new, sustainable funding model was needed: one that could attract long-term capital, spread costs fairly, and give operators and authorities confidence in the future.

The Solution

In 2021, Rock launched Rock Road to deliver exactly that –  applying its proven infrastructure financing approach from the rail sector to the UK’s clean bus revolution.

Working with Aviva, the National Wealth Fund, and HSBC, Rock created a dedicated investment platform that channels infrastructure-style finance from pension funds and institutional investors directly into zero-emission bus projects.

This model provides:

Impact

The platform has already raised £100 million, with capacity to scale to £1 billion per year over the next decade – providing a consistent source of affordable capital for local authorities and operators.

Rock’s model ensures that the total cost of ownership (TCO) of electric buses can now be lower than diesel equivalents, thanks to both cheaper long-term finance and reduced operating costs.

In London, Rock has financed 120 zero-emission buses under 7-year leases aligned with Transport for London’s contract lengths. This structure gives operators flexibility and certainty:

The Future

Rock Road’s ambition is to support the rollout of zero-emission fleets across the UK – helping local authorities and operators meet climate goals without overextending public budgets.

By leveraging limited government funding to attract large-scale private capital – for example, £10 million of public investment unlocking over £250 million in total funding – Rock’s model accelerates decarbonisation while keeping costs low for the public sector.

Our ambition is to make electric buses the default choice - not because of subsidy, but because they are the best economic and environmental option.
Louis Swindell
Commercial Director, Rock Road