Govia Thameslink Railway: Britain’s busiest railway

Pre-nationalisation in May 2026, Go-Ahead, through our Govia joint venture with Keolis, ran the largest and most complex rail franchise in the UK for over two decades. Govia Thameslink Railway (GTR) carries roughly one in five of every rail journey made in Britain, through London and much of the South East. Every day, hundreds of thousands of people rely on GTR to travel into and across the capital on services that connect Brighton, Cambridge, Peterborough, Gatwick and dozens of towns in between. 

Govia, the joint venture between Go-Ahead and Keolis, has been operating commuter rail since 1996. Govia took on Southern in 2001, absorbed Gatwick Express in 2008, and were awarded the combined Thameslink, Southern and Great Northern franchise in 2014. GTR comprises of four operating brands, that together carried around 279 million passenger journeys a year. 

• Thameslink: North-south services through the heart of London, running up to 24 trains an hour through the central core. 
• Southern: The south London commuter network, connecting the capital with Sussex, the south coast and the Surrey suburbs. 
• Great Northern : Connects north London to Cambridge, Peterborough and King’s Lynn, including the recently digitised Northern City Line. 
• Gatwick Express: The dedicated express service between London Victoria and Gatwick Airport.

Modernising one of the country’s oldest fleets 

A railway is only as good as the trains that run on it. Between 2014-2019, GTR’s £2 billion train modernisation programme replaced ageing rolling stock with more than 1,500 new carriages – turning what had been one of the UK’s oldest fleets into one of its most modern. 

New Class 700s entered service on Thameslink, new Class 717s replaced 40-year-old trains on Great Northern, and a new Class 387 fleet was rolled out across Gatwick Express. For customers, that meant air conditioning, better accessibility, real-time travel information and Wi-Fi becoming the standard rather than the exception. 

GTR was also the first mainline operator in the UK to introduce digital signalling, on the Thameslink core in 2019, and went on to lead the £2 billion East Coast Digital Programme –  Britain’s first major brownfield digital signalling project. The £100 million Project Aurora upgrade brought live CCTV and remote diagnostics to fleets across the network, helping crews fix issues before they affected customers or delayed services. 

All of this was delivered alongside the £6 billion Thameslink Programme (2009-2020), which expanded London’s rail capacity by 50% through the rebuilding of London Bridge, modernising of stations from Kings Cross to Gatwick, and bringing in new signalling. 

Social value: a railway that showed up for its communities 

At Go-Ahead, customers sit at the centre of our values. That is why so much of our work on GTR went into improving and innovating across the passenger experience, to make travel easier and more convenient for the millions of people who relied on the network every day, with a more welcoming journey from start to finish. 

• Pre-booked assistance journeys grew from 55,000 to 74,000 in two years between 2023-2025, providing a more accessible service for customers with additional needs. 
• Customer satisfaction climbed to 90% on Great Northern and 83% on Southern. 
• Staff training enabled nearly 600 suicide prevention interventions across the network from 2019 onwards. 
• Through the Your Station, Your Community fund, GTR backed local charities working on mental health, education, employability and the environment.

Economic value: investment that landed locally 

GTR pioneered industry-leading methods for measuring and reporting social value. In GTR’s final Social Impact Report (December 2024 to March 2025), 72% of contracts were awarded to small and medium enterprises, generating £1.58 million in additional value and strengthening local economic participation. 

That sat alongside billions of pounds of investment delivered into Britain’s rail infrastructure: new fleets, signalling, stations and digital systems, with much of it delivered through UK suppliers. 

A legacy to be proud of 

After more than a decade running the busiest railway in the country, Go-Ahead helped turn one of the most demanding networks in Europe into a more modern, more reliable and more welcoming railway for the millions of people who depended on it every day. 

With more passengers carried, more journeys modernised and more communities better connected, this is the legacy we are proud to have delivered.