Govia Thameslink Railway

Govia Thameslink Railway (GTR) was a British train operating company that operated the TSGN rail franchise. Within the franchise, GTR ran trains under the sub-brands: Thameslink, Great Northern, Southern, and Gatwick Express. GTR was a subsidiary of Govia, which was itself a joint venture between the British Go-Ahead Group (65%) and French company Keolis (35%).

The franchise was awarded, after repeated delays, to Govia Thameslink Railway on 23 May 2014. On 14 September 2014, GTR took over operations for the prior franchisee First Capital Connect; during July 2015, both Southern and Gatwick Express operations were integrated into GTR. This change made it the largest rail franchise in terms of passengers, staff and fleet in the UK. The franchise has an unusual structure involving a management contract that sees all fare revenues going straight to the Department for Transport (DfT), which in turn pays GTR fixed amounts that add up to £8.9 billion across its first seven years of operation.

GTR introduced several fleets of new trains, including the Class 387, Class 700, and Class 717. In terms of infrastructure, Govia planned to invest £50 million into the 239 stations it manages to improve accessibility, replace information systems, and increase staffing hours, alongside general redevelopment work. Various measures at increasing capacity and improving service were also planned, such as the doubling of overnight Thameslink services, half-hourly King's Lynn to London services, and extending the Oyster card network.

As early as June 2016, GTR was facing public criticism from officials over its performance, including calls from the Mayor of London Sadiq Khan for it to be stripped of the franchise. In May 2018, the company introduced a new timetable which included the first regular services through the Canal Tunnels and to other new destinations previously not served by Thameslink; however, an interim timetable that ran fewer trains had to be adopted due to frequent service issues. In response to the significant decline of passenger travel amid the COVID-19 pandemic, GTR considerably curtailed its services by mid-2020. GTR is one of several train operators that experienced severe disruption of services due to the 2022–2024 United Kingdom railway strikes.

GTR was succeeded by Thameslink Southern Great Northern on 31 May 2026.