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Thameslink is a main line route on the British railway network, running from , , , , , and via Central London to , , , Rainham, , , and . The initial network opened as a through service in 1988 and, as of 2025, currently calls at 135 stations in regular service. The entire route is currently operated by Govia Thameslink Railway. A part of the route, from to , runs 24 hours a day, except on early Sunday mornings and during maintenance periods.
The Thameslink Programme was a major £7billion scheme to increase capacity on the central London section by accommodating more frequent and longer trains, and providing additional routes and destinations. The programme was divided into three key phases, with the final Key Output 2 introducing world-first Automatic Train Operation (ATO) technology over European Train Control System (ETCS) Level 2, enabling 24 trains per hour through the core section. The new services began operating in 2018, though the full projected timetable of 24 trains per hour has never been achieved. In 2016, new trains started operating on the route and replaced the , and trains which were withdrawn and transferred elsewhere.
Passenger services on the Thameslink route, along with all others currently operated by Govia Thameslink Railway, are due to transfer to the public ownership operator Thameslink Southern Great Northern on 31 May 2026.
The route through central London (today known as Thameslink core) is via St Pancras International for connections to Eurostar and the East Midlands; , for London Underground Circle, Metropolitan and Hammersmith & City lines, and the Elizabeth line; , which replaced the demolished Holborn Viaduct station and has a southern entrance serving Ludgate Circus; , for main-line rail services and the Underground District line and Circle lines; and for main-line links into Kent and Sussex and the Underground Northern line and Jubilee line lines. on Pentonville Road closed on 8 December 2007.
Trains operating the "main line" service (Bedford and Cambridge to Brighton, Peterborough to Horsham) include first-class accommodation; those operating from Luton, St Albans and Kentish Town to Sutton, Sevenoaks and Orpington are usually standard class only. When Govia operated the original Thameslink franchise these services were designated "Thameslink CityFlier" and "Thameslink CityMetro" respectively, but First Capital Connect dropped this branding. Govia Thameslink Railway now refers to these services as Route TL1 (formerly Route 6) and Route TL2/TL3 (formerly Route 7/8) respectively.
| +Thameslink Monday–Friday off-peak service pattern |
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As well as these services, during peak hours, several extra trains in each direction (approximately two trains per hour) run to/from (originating/terminating at either London Blackfriars, Luton, West Hampstead Thameslink or Kentish Town), all calling at 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 (originating/terminating at either Bedford, West Hampstead Thameslink, St Pancras International or London Bridge), which, after calling at South Croydon, call at , , , , , , and .
During peak hours, Peterborough to Horsham services call at Faygate between Ifield and Littlehaven, providing the primary service to this station.
During the morning peak hours only, southbound Peterborough to Horsham services call at Knebworth.
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.
On 14 June 1941, railway manager George Dow proposed in an article in The Star a series of electrified, underground main-line routes to interconnect London's termini, arguing that "London suburban lines cannot play their full part... until they have been interconnected across London and electrified". This vision was further developed in the post-war County of London Plan (1943) and Greater London Plan (1944). A 1949 working party identified a high-priority "Route A" that closely resembled the future Thameslink, designed to integrate suburban services and relieve Underground congestion. These ambitious plans were shelved due to post-war austerity, and the Snow Hill Tunnel route remained open only for cross-London freight trains until 1970.
Overhead electrification, completed in 1982, allowed the northern section to run as the Midland City Line from Bedford via the Midland Main Line to St Pancras, and via the Widened Lines to Moorgate station.
The project faced significant institutional resistance. London Transport initially blocked the Parliamentary legislation required for the project, officially due to a dispute over land at Farringdon, but with the "suspicion... that it fears extra competition." An editorial at the time called for the Transport Secretary to "bang BR and LT heads together to get this scheme on the rails as fast as possible." Ultimately, the project received government approval with the passage of the British Rail Bill in 1986, which provided for the reopening and electrification of the tunnel to link the Midland and Southern Regions.
On 29 January 1990, the section between Blackfriars and Farringdon was temporarily closed to permit the construction of a new alignment. The route through the site of the long-closed Ludgate Hill station, over Ludgate Hill to Holborn Viaduct was abandoned and demolished. The replacement route under Ludgate Hill was opened on 29 May 1990 by the Network SouthEast (sector of British Rail) concurrently with station, which was initially called St Paul's Thameslink but was renamed in 1991 to avoid confusion with St. Paul's Underground station, about away.
King's Cross Thameslink on Pentonville Road closed on 8 December 2007, when the Thameslink platforms at nearby St Pancras opened.
By late 1998, more than 28,000 passengers were carried at morning peak times.
From 1 April 2006, the franchise was taken over by First Capital Connect along with some services that had been operated by WAGN. The branding of most trains, stations, and signs was changed to match the name of the new company, but City Thameslink and West Hampstead Thameslink were not renamed as Thameslink referred to the route. After criticism of the loss of the apt name for this group of routes, First Capital Connect's publicity began calling this set of services its "Thameslink route" to distinguish it from the former WAGN services.
On 14 September 2014, Govia Thameslink Railway took over operations from First Capital Connect.
Network Rail obtained planning permission and legal powers in 2006, funding was secured in July 2007 and construction began in October 2007.
The infrastructure budget increased by £474 million (9.4%) from the original 2012 budget, primarily due to unforeseen complexities at London Bridge station. London Bridge station's long history of development and bomb damage during World War Two meant that much of the site was inadequately documented, requiring design changes and accelerated works to maintain the project schedule.
Plans included rebuilding the station buildings at Farringdon (in conjunction with the Crossrail project) and West Hampstead Thameslink, total rebuild of London Bridge and Blackfriars stations, two new underground platforms at St Pancras International, a new tunnel north of St Pancras International to the East Coast Main Line to allow through services to Peterborough and Cambridge, and platform lengthening. A new 8- and 12-carriage fleet of Class 700 trains began in 2016. The new services on to the Great Northern route began initially on 8 March 2018, with the full timetable introduced in December 2019, one year later than originally planned to manage risks associated with introducing the complex service changes.
The programme also identified the need for an additional £900 million of maintenance and renewals work to ensure the wider rail network could reliably support the new high-frequency services, though initial funding covered only £300 million of this work.
The London and South East Route Utilisation Strategy published in July 2011 laid out a provisional 24 timetable. South of London it would provide four trains to Brighton (one semi-fast, one stopping) and two each to Three Bridges, Horsham, East Grinstead, Caterham, Tattenham Corner, Tunbridge Wells, Ashford International, Maidstone East, Sevenoaks and Bellingham. North of London there would be eight semi-fast trains to Bedford, four stopping trains to St Albans, two stopping and two semi-fast trains to Luton, two semi-fast trains to Peterborough, two semi-fast trains to Cambridge and four stopping trains to Welwyn Garden City.
Below is a provisional timetable solely for services running through the 'Thameslink core' tunnel. This 'provisional timetable' was proposed before the upgrade and has not yet been achieved. See Services section above for the current service pattern.
| Siemens Desiro | 700 Desiro City | EMU | 100 | 161 | 60 | 8 | All Thameslink services | 20152018 | |
| 55 | 12 | ||||||||
Due to problems with the InterCity West Coast tendering process, the process was delayed, with the new franchise delayed until September 2014. The new franchise includes the South Central franchise currently operated by Southern and certain routes from the Integrated Kent Franchise currently operated by Southeastern.
In May 2014, it was announced that the franchise has been awarded to Govia Thameslink Railway. The new Thameslink Southern & Great Northern franchise will include both the Thameslink Great Northern and South Central franchises.
Govia Thameslink Railway began operations on 14 September 2014, with the former First Capital Connect routes Thameslink and Great Northern.
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