# Govia Thameslink Railway

Govia Thameslink Railway (GTR) is a British train operating company that operates the TSGN rail franchise. Within the franchise, GTR runs trains under the sub-brands: Thameslink, Great Northern, Southern, and Gatwick Express. GTR is a subsidiary of Govia, which is 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 are experiencing severe disruption of services due to the 2022–2024 United Kingdom railway strikes.

## History
### Background

During 2006, the Thameslink and Great Northern services were merged into a single franchise due to the upcoming Thameslink Programme. In 2012, the British government announced that services of First Capital Connect, Southern (with Gatwick Express) and some Southeastern routes would be merged into a single Thameslink, Southern and Great Northern franchise (TSGN). The Invitation to Tender was to have been issued in October 2012, with the successful bidder announced during Spring 2013 and TSGN originally due to start in September 2013. However, following the collapse of the InterCity West Coast re-franchising process, it was decided to enact a temporary freeze on all franchising competitions until January 2013.
In January 2013, the government announced that it would extend the existing contract through to March 2014, and that it intended to negotiate with FirstGroup to operate the franchise under a management contract for up to two years. In March 2013, the Secretary of State for Transport announced that the franchise would be extended again to run up to 13 September 2014, and that the future franchise would be a management-style contract due to the level of investment and change on the route. During September 2013, a revised invitation to tender was issued. On 23 May 2014, it was announced that Govia Thameslink Railway had been awarded the franchise.
On 14 September 2014, Govia Thameslink Railway (GTR) took over services from First Capital Connect; at the commencement of operations, it served 122 stations and operated a fleet of 226 trains. The separate Thameslink and Great Northern brands were maintained upon the GTR takeover. During December 2014, full control was taken of the Sevenoaks Thameslink service, previously operated jointly with Southeastern. During July 2015, both Southern and Gatwick Express became a part of GTR, making it the largest rail franchise in terms of passengers, staff and fleet in the UK.
The franchise has an unusual structure: it is a management contract where fare income does not go to GTR. Under their original contract, the Department for Transport pays GTR £8.9 billion over the first seven-year period and receives all revenue. Consequently, the company carries less revenue risk. This form of franchise was chosen because of long-term engineering works anticipated around London, which would be a significant challenge to organise within the normal form of franchise.

### Changes and disruptions

During December 2015, GTR announced that the majority of its ticket prices would be frozen, and that the average fare rise for the coming year would be only 0.8%.
In June 2016, amongst criticism of the performance of its services, Go-Ahead warned of lower than anticipated profits on the franchises, leading to 18% drop in the Go-Ahead share price. Passengers had previously rated its Thameslink service as the worst in the country. Only 20% of Southern trains arrived on time in the year from April 2015 to March 2016, and there was an ongoing industrial dispute over driver-only operated trains. On 12 July 2016, after 15% of Southern services were cancelled for a period of weeks to improve service reliability, Mayor of London Sadiq Khan called for GTR to be stripped of the franchise. On 15 July 2016, citing the issues, Rail Minister Claire Perry resigned from her position.
In response to the significant decline of passenger travel amid the COVID-19 pandemic, GTR considerably curtailed its services by mid-2020. Between 30 March 2020 and 3 April 2022, Gatwick Express services were suspended.
In March 2022, following changes made due to COVID-19, the DfT gave GTR a direct-award contract expiring on 1 April 2025, with the option for the government to extend this until 1 April 2028 at the latest.
GTR is one of several train operators impacted by the 2022–2024 United Kingdom railway strikes, which are the first national rail strikes in the UK for three decades. Its workers are amongst those who have voted in favour of taking industrial action due to a dispute over pay and working conditions. GTR is only capable of operating a very minimal timetable on any of the planned dates for the strikes due to the number of staff involved.

## Thameslink and Great Northern services

Govia Thameslink Railway has operated Thameslink and Great Northern services since 14 September 2014. Thameslink is a 68-station main-line route running 225 km (140 miles) north to south through London from Bedford to Brighton, serving both London Gatwick Airport and London Luton Airport, with a suburban loop serving Sutton, Mitcham and Wimbledon and on weekdays a suburban line via Catford and Bromley South to Sevenoaks. Great Northern is the name of the suburban rail services run on the southern end of Britain's East Coast Main Line and associated branches. Services operate to or from London King's Cross and Moorgate. Destinations include Hertford North, Welwyn Garden City, Stevenage, Peterborough, Cambridge and King's Lynn.
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, due to frequent disruption of services on the whole network, Govia decided to create a new interim timetable with a reduced number of trains; this came into operation in July 2018.

### Thameslink service pattern
#### Off-peak

The Monday–Friday off-peak service pattern, with frequencies in trains per hour (tph), includes:
Thameslink Monday–Friday off-peak service pattern :
| Route | tph | Calling at |
| Bedford to Brighton | 2 | FlitwickHarlingtonLeagraveLutonLuton Airport ParkwayHarpendenSt Albans CityWest Hampstead ThameslinkLondon St Pancras InternationalFarringdonCity ThameslinkLondon BlackfriarsLondon BridgeEast CroydonGatwick AirportThree BridgesBalcombeHaywards HeathWivelsfieldBurgess HillHassocksPreston Park |
| Bedford to Three Bridges via Redhill | 2 | FlitwickHarlingtonLeagraveLutonLuton Airport ParkwayHarpendenSt Albans CityLondon St Pancras InternationalFarringdonCity ThameslinkLondon BlackfriarsLondon BridgeNorwood JunctionEast CroydonSouth CroydonPurleyRedhillEarlswoodSalfordsHorleyGatwick Airport In the evening, this service only runs between Luton and Three Bridges |
| Peterborough to Horsham via Redhill | 2 | HuntingdonSt NeotsSandyBiggleswadeArleseyHitchinStevenageFinsbury ParkLondon St Pancras InternationalFarringdonCity ThameslinkLondon BlackfriarsLondon BridgeEast CroydonCoulsdon SouthMersthamRedhillHorleyGatwick AirportThree BridgesCrawleyIfieldFaygate (extremely limited service in off-peak period)Littlehaven |
| Cambridge to Brighton | 2 | RoystonAshwell & MordenBaldockLetchworth Garden CityHitchinStevenageFinsbury ParkLondon St Pancras InternationalFarringdonCity ThameslinkLondon BlackfriarsLondon BridgeEast CroydonGatwick AirportThree BridgesHaywards HeathBurgess Hill |
| London Blackfriars to Sevenoaks via Catford and Otford | 2 | Elephant & CastleDenmark HillPeckham RyeNunheadCrofton ParkCatfordBellinghamBeckenham HillRavensbourneShortlandsBromley SouthBickleySt Mary CraySwanleyEynsfordShorehamOtfordBat & Ball |
| Luton to Rainham via Greenwich | 2 | Luton Airport ParkwayHarpendenSt Albans CityRadlettElstree & BorehamwoodMill Hill BroadwayBrent Cross WestWest Hampstead ThameslinkLondon St Pancras InternationalFarringdonCity ThameslinkLondon BlackfriarsLondon BridgeDeptfordGreenwichMaze HillWestcombe ParkCharltonWoolwich ArsenalPlumsteadAbbey WoodSlade GreenDartfordStone CrossingGreenhitheSwanscombeNorthfleetGravesendHighamStroodRochesterChathamGillingham In the evening, this service only runs between Kentish Town and Rainham |
| St Albans City to Sutton via Wimbledon (loop) | 2 | RadlettElstree & BorehamwoodMill Hill BroadwayHendonBrent Cross WestCricklewoodWest Hampstead ThameslinkKentish TownLondon St Pancras InternationalFarringdonCity ThameslinkLondon BlackfriarsElephant & CastleLoughborough JunctionHerne HillTulse HillStreathamTootingHaydons RoadWimbledonWimbledon ChaseSouth MertonMorden SouthSt HelierSutton CommonWest Sutton Services then continue to/from St Albans City via Mitcham Junction (see below) |
| St Albans City to Sutton via Mitcham Junction (loop) | 2 | RadlettElstree & BorehamwoodMill Hill BroadwayHendonBrent Cross WestCricklewoodWest Hampstead ThameslinkKentish TownLondon St Pancras InternationalFarringdonCity ThameslinkLondon BlackfriarsElephant & CastleLoughborough JunctionHerne HillTulse HillStreathamMitcham EastfieldsMitcham JunctionHackbridgeCarshalton Services then continue to/from St Albans City via Wimbledon (see above) |

#### Peak hours

During peak hours, the two trains per hour London Blackfriars to Sevenoaks service (from the table above) is extended through the 'core section' to/from Welwyn Garden City (though a few services originate at Finsbury Park), with extra calls at City Thameslink, Farringdon, St Pancras International, Finsbury Park, New Southgate, Oakleigh Park, New Barnet, Potters Bar and Hatfieldonly.
As well as these services, during peak hours, several trains in each direction (approximately two trains per hour) run to/from Orpington (originating/terminating at either London Blackfriars, Luton, West Hampstead Thameslink or Kentish Town), all calling at Petts Wood in lieu of stations from St Mary Cray to Bat & Ball.
In addition, there are seven trains per day in each direction that operate to/from East Grinstead (originating/terminating at either Bedford, West Hampstead Thameslink, St Pancras International or London Bridge), which, after calling at South Croydon, call at Sanderstead, Riddlesdown, Upper Warlingham, Woldingham, Oxted, Hurst Green, Lingfield and Dormans.
There are also three extra trains throughout the evening peak hours that operate from Gatwick Airport to Bedford in that direction only, calling at various stations.

### Great Northern service pattern

Since the introduction of regular services through the Canal Tunnels during May 2018, many GTR services on the East Coast Main Line were rebranded from Great Northern to Thameslink. Most of these services have been extended through central London and incorporated into the Thameslink network (as per above), although as of October 2019 some services are yet to be extended. The only services to retain the Great Northern brand are those on the Northern City Line, the stopping services to/from Cambridge and Letchworth Garden City and the express services to/from Cambridge, Ely and King's Lynn, as well as Peterborough at peak times.
The Great Northern Monday-Friday off-peak service pattern, as of December 2024, with frequencies in trains per hour (tph), consists of the following:
| Route | tph | Calling at |
| London King's Cross to Ely | 1 | Cambridge, Cambridge North, Waterbeach |
| London King's Cross to King's Lynn | 1 | Cambridge, Cambridge North, Waterbeach, Ely, Littleport, Downham Market, Watlington |
| London King's Cross to Letchworth Garden City | 1 | Finsbury Park, Alexandra Palace, Potters Bar, Hatfield, Welwyn Garden City, Welwyn North, Knebworth, Stevenage, Hitchin |
| London King's Cross to Cambridge | 1 | Finsbury Park, Alexandra Palace, Potters Bar, Hatfield, Welwyn Garden City, Welwyn North, Knebworth, Stevenage, Hitchin, Letchworth Garden City, Baldock, Royston, Meldreth, Shepreth, Foxton |
| Moorgate to Welwyn Garden City | 2 | Old Street, Essex Road, Highbury & Islington, Drayton Park, Finsbury Park, Harringay, Hornsey, Alexandra Palace, New Southgate, Oakleigh Park, New Barnet, Hadley Wood, Potters Bar, Brookmans Park, Welham Green, Hatfield |
| Moorgate to Stevenage via Hertford North | 2 | Old Street, Essex Road, Highbury & Islington, Drayton Park, Finsbury Park, Harringay, Hornsey, Alexandra Palace, Bowes Park, Palmers Green, Winchmore Hill, Grange Park, Enfield Chase, Gordon Hill, Crews Hill, Cuffley, Bayford, Hertford North, Watton-at-Stone |

## Southern and Gatwick Express services

The Southern and Gatwick Express brands joined Govia Thameslink Railway on 26 July 2015. Southern routes run from London Victoria and London Bridge through the South London suburbs of Battersea, Norbury, Peckham, Sydenham, Crystal Palace, Norwood, Croydon, Streatham, Purley and Sutton to towns surrounding London including Caterham, Epsom and Tadworth. Further afield, Southern also serve Redhill, Tonbridge, Uckfield, East Grinstead, Gatwick Airport, Brighton, Ashford (Kent), Worthing, Hastings, Portsmouth, Eastbourne, Horsham, Southampton, Littlehampton and Bognor Regis. Additionally, Southern run West London route services from Milton Keynes to South Croydon via Watford and Clapham Junction. Since 2008, Southern has operated the Gatwick Express service from London Victoria to Gatwick Airport and Brighton.

### Gatwick Express

Gatwick Express operates an express commuter and airport transfer service between London Victoria, Gatwick Airport, Haywards Heath and Brighton. Between 6:00 am and 9:00 am on weekdays, northbound services call additionally at Preston Park, Hassocks and Burgess Hill. Services stop additionally at the same stations in the southbound direction between 5:00 pm and 8:00 pm.
As of May 2023, the off-peak Monday-Saturday, with frequencies in 'trains per hour' (tph), consists of:
| Route | tph | Calling at |
| London Victoria – Brighton | 2 | Gatwick Airport, Haywards Heath |
On Sundays, Gatwick Express operates a half-hourly shuttle service between London Victoria and Gatwick Airport only.

### Southern

The standard off-peak service as of June 2024 is:
Brighton Main Line :
| Route | tph | Calling at |
| London Victoria – Littlehampton | 2 | Clapham Junction, East Croydon, Gatwick Airport, Haywards Heath, Burgess Hill, Hassocks, Preston Park, Hove, Portslade, Shoreham-by-Sea, Lancing, Worthing, West Worthing, Durrington-on-Sea, Goring-by-Sea, Angmering |
| London Victoria – Eastbourne | 1 | Clapham Junction, East Croydon, Gatwick Airport, Haywards Heath, Wivelsfield, Cooksbridge, Lewes, Polegate, Hampden Park |
| London Victoria – Ore | 1 | Clapham Junction, East Croydon, Gatwick Airport, Haywards Heath, Wivelsfield, Plumpton, Lewes, Polegate, Eastbourne, Hampden Park, Pevensey & Westham, Normans Bay, Cooden Beach, Collington, Bexhill, St Leonards Warrior Square, Hastings |
| Arun Valley line |||
| Route | tph | Calling at |
| London Victoria – Portsmouth Harbour via Crawley | 2 | Clapham Junction, East Croydon, Gatwick Airport, Three Bridges, Crawley, Horsham, Barnham, Chichester, Fishbourne (1tph), Bosham (1tph), Nutbourne (1tph), Southbourne, Emsworth, Warblington (1tph) , Havant, Hilsea, Fratton, Portsmouth & Southsea This route splits/merges at Horsham with the route to Bognor Regis (see below). Fishbourne, Bosham, Nutbourne and Warblington are served by the same train |
| London Victoria – Bognor Regis via Crawley | 2 | Clapham Junction, East Croydon, Gatwick Airport, Three Bridges, Crawley, Horsham, Christ's Hospital, Billingshurst, Pulborough, Amberley, Arundel, Ford, Barnham This route splits/merges at Horsham with the route to Portsmouth Harbour, see above. |
| Seaford branch line |||
| Route | tph | Calling at |
| Brighton – Seaford | 2 | London Road (Brighton), Moulsecoomb, Falmer, Lewes, Southease (1tph), Newhaven Town, Newhaven Harbour (1tph), Bishopstone Services alternate between serving Southease and Newhaven Harbour |
| East Coastway and Marshlink lines |||
| Route | tph | Calling at |
| Brighton – Eastbourne | 1 | London Road (Brighton), Moulsecoomb, Falmer, Lewes, Glynde, Berwick, Polegate, Hampden Park |
| Brighton – Ore | 1 | Falmer, Lewes, Polegate, Hampden Park (Ore-bound only), Eastbourne, Hampden Park (Brighton-bound only), Bexhill, St Leonards Warrior Square,Hastings |
| Eastbourne – Ashford International | 1 | Hampden Park, Pevensey & Westham, Cooden Beach, Collington, Bexhill, St Leonards Warrior Square, Hastings, Ore, Three Oaks , Winchelsea, Rye, Appledore, Ham Street |
| West Coastway line |||
| Route | tph | Calling at |
| Brighton – Southampton Central | 2 | Hove, Portslade, Southwick, Shoreham-by-Sea, Lancing, Worthing, Angmering, Ford, Barnham, Chichester, Southbourne, Emsworth, Havant, Cosham, Portchester (1tph) Fareham, Swanwick, Woolston |
| Brighton – Portsmouth & Southsea | 1 | Hove, Portslade, Southwick, Shoreham-by-Sea, Lancing, East Worthing, Worthing, West Worthing, Durrington-on-Sea, Goring-by-Sea , Angmering, Barnham, Chichester, Havant, Fratton |
| Brighton to Chichester via Littlehampton | 1 | Hove, Aldrington, Portslade, Fishersgate, Southwick, Shoreham-by-Sea, Lancing, East Worthing, Worthing, West Worthing, Durrington-on-Sea, Goring-by-Sea, Angmering, Littlehampton, Ford, Barnham, |
| Barnham – Bognor Regis | 2 | Shuttle service |
| Oxted line |||
| Route | tph | Calling at |
| London Victoria – East Grinstead | 1 | Clapham Junction, East Croydon, Sanderstead, Riddlesdown, Upper Warlingham, Woldingham, Oxted, Hurst Green, Lingfield, Dormans |
| London Bridge – Uckfield | 1 | East Croydon, Oxted, Hurst Green, Edenbridge Town, Hever, Cowden, Ashurst, Eridge, Crowborough, Buxted |
| Reigate and Redhill–Tonbridge line |||
| Route | tph | Calling at |
| London Victoria – Reigate | 2 | Clapham Junction, East Croydon, Purley, Coulsdon South, Merstham, Redhill |
| Redhill – Tonbridge | 1 | Nutfield, Godstone, Edenbridge, Penshurst, Leigh |
| West London Route |||
| Route | tph | Calling at |
| Watford Junction – East Croydon | 1 | Harrow & Wealdstone, Wembley Central, Shepherd's Bush, Kensington (Olympia), West Brompton, Imperial Wharf, Clapham Junction, Balham, Streatham Common, Norbury, Thornton Heath, Selhurst 2tpd starts/terminates at Clapham Junction 1tpd starts/terminates at Selhurst |
| Mole Valley Line |||
| Route | tph | Calling at |
| London Victoria – Dorking via Carshalton | 1 | Clapham Junction, Balham, Mitcham Eastfields, Mitcham Junction, Hackbridge, Carshalton, Sutton, Cheam, Epsom, Ashtead, Leatherhead |
| London Victoria – Horsham via Carshalton | 1 | Clapham Junction, Balham, Mitcham Eastfields, Mitcham Junction, Hackbridge, Carshalton, Sutton, Cheam, Ewell East, Epsom, Ashtead, Leatherhead, Box Hill & Westhumble, Dorking, Holmwood, Ockley, Warnham |
| London Victoria – Epsom Downs via Norbury | 2 | Battersea Park, Clapham Junction, Wandsworth Common, Balham, Streatham Common, Norbury, Thornton Heath, Selhurst, West Croydon, Waddon, Wallington, Carshalton Beeches, Sutton, Belmont, Banstead |
| London Bridge – Epsom | 2 | Norwood Junction, West Croydon, Waddon, Wallington, Carshalton Beeches, Sutton, Cheam, Ewell East |
| Caterham and Tattenham Corner lines |||
| Route | tph | Calling at |
| London Bridge – Caterham | 2 | Norwood Junction, East Croydon, South Croydon, Purley Oaks, Purley, Kenley, Whyteleafe, Whyteleafe South This route splits/merges at Purley with the route to Tattenham Corner, see below. |
| London Bridge – Tattenham Corner | 2 | Norwood Junction, East Croydon, South Croydon, Purley Oaks, Purley, Reedham, Coulsdon Town, Woodmansterne, Chipstead, Kingswood, Tadworth This route splits/merges at Purley with the route to Caterham, see above. |
| London via Crystal Palace and/or Tulse Hill |||
| Route | tph | Calling at |
| London Victoria – West Croydon via Crystal Palace | 2 | Battersea Park, Clapham Junction, Balham, Streatham Hill, West Norwood, Gipsy Hill, Crystal Palace, Norwood Junction |
| London Victoria – London Bridge via Crystal Palace | 2 | Battersea Park, Clapham Junction, Wandsworth Common, Balham, Streatham Hill, West Norwood, Gipsy Hill, Crystal Palace, Sydenham, Forest Hill, Honor Oak Park, Brockley, New Cross Gate |
| London Bridge – East Croydon via Tulse Hill | 2 | South Bermondsey, Queens Road Peckham, Peckham Rye, East Dulwich, North Dulwich, Tulse Hill, Streatham, Streatham Common, Norbury, Thornton Heath, Selhurst |
| London Bridge – Beckenham Junction via Tulse Hill and Crystal Palace | 2 | South Bermondsey, Queens Road Peckham, Peckham Rye, East Dulwich, North Dulwich, Tulse Hill, West Norwood, Gipsy Hill, Crystal Palace, Birkbeck |

## Franchise commitments

This franchise is different from many other franchises let since the start of railway privatisation in 1996. Under the agreed terms of the franchise, the operator, in this case Govia, gives all revenue to the government, rather than paying set premiums. The Department for Transport will pay Govia, totalling around £8.9 billion over the franchise period of seven years, from the expected revenues of £12.4 billion. From these payments, Govia expects to generate a 3% profit, and the risks on operating costs will be Govia's, while the DfT will profit or lose from fluctuations in revenue.
Prior to the start of the franchise, Govia stated its plans to invest £50 million in all 239 stations that it would manage. The specifics of these plans include:
* Enhance all 239 stations including improving access, replace electronic information screens and working with local authorities on the redevelopment of St Albans and Luton stations.
* Increase staffing hours at many stations, with the 100 busiest stations staffed from first to last train, like London Overground stations.
* Extension of 'the key' smartcard which Southern has been introducing.
* Provide 104 stations with free Wi-Fi.
* £1.5 million on station access improvements including increased cycle storage and electrical vehicle charging points.
Govia also stated its intention to bring about the following:
* Half-hourly King's Lynn to London services
* Direct Peterborough, Cambridge, Welwyn Garden City and Finsbury Park to Tattenham Corner, Caterham, Horsham services.
* Increasing Great Northern suburban services to four trains per hour via Enfield Chase and New Barnet
* Great Northern suburban services to run to Moorgate at weekends and on weekday evenings
* 50% increase in capacity from Uckfield to London in the peaks.
* Doubling overnight Thameslink services
* Sevenoaks Thameslink services to run on Saturdays
* Working to extend Oyster to Epsom, Gatwick Airport, Luton Airport Parkway, Welwyn Garden City and Hertford North
* Class 387 Electrostars for King's Lynn express services, releasing Class 317s, 321s and some Class 365s for newly electrified routes elsewhere.
* Creating an alliance arrangement with Network Rail in 2016, like South West Trains.

## Rolling stock

In order to replace the Class 319 trains and to operate the expanded Thameslink network, a fleet of 115 eight- and twelve-car Class 700 trains had been procured during the franchise term of First Capital Connect. These entered service between 2016 and 2019.
As a consequence of the delayed procurement of the Class 700 trains, 29 Class 387 trains had also been ordered for the Thameslink route to release the Class 319 trains to newly electrified routes. Deliveries were completed during 2014 and the trains entered service later that year. It was originally planned that once the Class 700s began entering service, the Class 387s would be transferred to Great Western Railway for use on routes in the Thames Valley. However, a change of plans saw GWR order an entirely new fleet of Class 387s, so the Thameslink units were instead cascaded to the Great Northern route following delivery of the Class 700s.
In addition to these, GTR ordered 25 new six-car trains to replace 40-year-old Class 313 units, which were being run on the Great Northern suburban services out of Moorgate. During December 2015, Siemens was selected to provide these as a follow-on to the Class 700 order. They were designated as the Class 717 in June 2016, and were first introduced in September 2018.
In September 2022, 3 Class 171 trains were transferred to East Midlands Railway with the remaining trains reconfigured into 2 and 3 car formations.
In April 2023, GTR issued a tender for between 21 and 30 new trains to provide additional capacity for their Great Northern route. In March 2024, it was announced that Great Northern would lease all 30 Class 379s previously used by Greater Anglia. As of November 2024, the trains have been accepted for service and are expected to enter service in 2025.
In May 2023 the Southern Class 313 units were withdrawn from service.
In November 2024, Southeastern announced that 13 Class 377 units would be transferred from Southern. The first two units will transfer before the December 2024 timetable change with the remaining units expected to transfer before December 2025.
Govia Thameslink Railway issued a tender in April 2023 for between 21 and 30 four-coach 100 mph (160 km/h) trains, with an estimated value of £48.6 million. On 12 March 2024 it was announced that Great Northern would lease the full 30-unit fleet of Class 379 units. The units entered service on 10 February 2025.

### Current fleet

| Family | Class | Image | Type | Top speed | Top speed | Number | Carriages | Routes operated | Built |
| Family | Class | Image | Type | mph | km/h | Number | Carriages | Routes operated | Built |
| Southern ||||||||||
| Bombardier Turbostar | 171/2 | | DMU | 100 | 160 | 1 | 3 | Brighton Main Line (London Bridge to South Croydon) Oxted line (to Uckfield only) East Coastway line Marshlink line | 2003–04 |
| Bombardier Turbostar | 171/7 | | DMU | 100 | 160 | 12 | 3 | Brighton Main Line (London Bridge to South Croydon) Oxted line (to Uckfield only) East Coastway line Marshlink line | 2003–04 |
| Bombardier Turbostar | 171/8 | | DMU | 100 | 160 | 4 | 2 | Brighton Main Line (London Bridge to South Croydon) Oxted line (to Uckfield only) East Coastway line Marshlink line | 2003–04 |
| Bombardier Electrostar | 377/1 | | EMU | 100 | 160 | 64 | 4 | Entire Southern network apart from sections between Hurst Green and Uckfield & between Ore and Ashford International | 2001–05 |
| Bombardier Electrostar | 377/2 | | EMU | 100 | 160 | 15 | 4 | Entire Southern network apart from sections between Hurst Green and Uckfield & between Ore and Ashford International | 2001–05 |
| Bombardier Electrostar | 377/3 | | EMU | 100 | 160 | 28 | 3 | Entire Southern network apart from sections between Hurst Green and Uckfield & between Ore and Ashford International | 2001–05 |
| Bombardier Electrostar | 377/4 | | EMU | 100 | 160 | 75 | 4 | Entire Southern network apart from sections between Hurst Green and Uckfield & between Ore and Ashford International | 2001–05 |
| Bombardier Electrostar | 377/6 | | EMU | 100 | 160 | 26 | 5 | Entire Southern network apart from sections between Hurst Green and Uckfield & between Ore and Ashford International | 2001–05 |
| Bombardier Electrostar | 377/7 | | EMU | 100 | 160 | 8 | 5 | Entire Southern network apart from sections between Hurst Green and Uckfield & between Ore and Ashford International | 2001–05 |
| Bombardier Electrostar | 387/2 | | EMU | 110 | 177 | 5 (Varies) | 4 | Units borrowed from Gatwick Express on a rotational basis according to demand. Brighton Main Line East Coastway line West Coastway line (Brighton to Southampton Central) | 2016–17 |
| Gatwick Express ||||||||||
| Bombardier Electrostar | 387 | | EMU | 110 | 177 | 22 | 4 | Gatwick Express services between London Victoria & Brighton | 2015–2016 |
| Great Northern ||||||||||
| Bombardier Electrostar | 379 | | EMU | 100 | 160 | 30 | 4 | Great Northern express services between London King's Cross & Ely / King's Lynn / Peterborough and Great Northern semi-fast services between London King's Cross & Letchworth Garden City / Cambridge | 2010–2011 |
| Bombardier Electrostar | 387 | | EMU | 110 | 177 | 38 | 4 | Great Northern express services between London King's Cross & Ely / King's Lynn / Peterborough and Great Northern semi-fast services between London King's Cross & Letchworth Garden City / Cambridge | 2014–2017 |
| Siemens Desiro | 717 Desiro City | | EMU | 85 | 137 | 25 | 6 | Northern City Line services between Moorgate & Welwyn Garden City / Stevenage via Hertford North | 2018 |
| Thameslink ||||||||||
| Siemens Desiro | 700 Desiro City | | EMU | 100 | 161 | 60 | 8 | All Thameslink services | 2015–2018 |
| Siemens Desiro | 700 Desiro City | | EMU | 100 | 161 | 55 | 12 | All Thameslink services | 2015–2018 |

### Past fleet

Former units operated by Thameslink, Southern and Great Northern include:
| Class | Image | Type | Top speed | Top speed | Carriages | Number | Built | Routes | Withdrawn |
| Class | Image | Type | mph | km/h | Carriages | Number | Built | Routes | Withdrawn |
| 171 | | DMU | 100 | 161 | 4 | 3 | 2003-2004 | Oxted line Marshlink line | 2022 |
| 365 Networker Express | | EMU | 100 | 161 | 4 | 40 | 1994-95 | Express services between London King's Cross and / Ely / King's Lynn / Peterborough | 2018–2021 |
| 313 | | EMU | 75 | 121 | 3 | 64 | 1976–1977 | Northern City Line West Coastway line East Coastway line Seaford branch line | 2019 (Great Northern) 2023 (Southern) |
| 319 | | EMU | 100 | 161 | 4 | 86 | 1987–19881990 | All Thameslink services | 2015–2017 |
| 321 | | EMU | 100 | 161 | 4 | 13 | 1989–1990 | Express services between London King's Cross to Peterborough and Cambridge | 2016 |
| 377 Electrostar | | EMU | 100 | 161 | 4 | 26 | 2008–2009 | Some Thameslink services | 2017 |
| 455 | | EMU | 75 | 120 | 4 | 46 | 1982–1984 | Metro and commuter services from London Victoria & London Bridge | 2022 |

## Performance

In February 2015, Thameslink and Great Northern came at the bottom of Which? magazine's Best and worst UK train companies customer survey, scoring a customer satisfaction score of 43%. Thameslink and Great Northern were also scored 2/5 stars in each of the specific categories covered by the survey (including Reliability, Punctuality and Cleanliness of toilets) – which is the worst performance of any UK train operator. In the Which? 2017 survey, Thameslink and Great Northern improved their performance slightly with a rating of 46% also, their position in the table was second to bottom(Southern were in bottom place, but had been subject huge disruption due to industrial action).
Passenger numbers on Govia Thameslink Railway (which also includes Southern and Gatwick Express) have risen from 262 million annually in 2010–11 to 327 million annually in 2015–16.