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London Underground and railway station
the former London and North Western Railway station in Oldham

Moorgate is a central London railway terminus and connected London Underground station on Moorgate in the City of London. Main line railway services for Hertford, Welwyn Garden City and Stevenage are operated by Great Northern, while the Underground station is served by the Circle, Hammersmith & City, Metropolitan and Northern lines. The station was opened as Moorgate Street in 1865 by the Metropolitan Railway. In 1900, the City & South London Railway added the station to its network, and the Great Northern & City Railway began serving the station in 1904. In 1975, the Northern City Line platforms were the site of the Moorgate tube crash – at the time, the worst peacetime accident in the history of the London Underground – in which 43 people were killed. Thameslink branch services were withdrawn in the early 21st century, and a new ticket hall was built connected to the newly opened Elizabeth line at in 2021, with through access to the rest of Liverpool Street Underground station.

The station has entrances on both Moorgate itself and Moorfields, which runs parallel. The public entrances from the street give access to all the train services at the station, there are three distinct levels. For terminating trains at busy times, there are platforms 3 and 4 which are west facing bays. Adjacent to these are platforms 5 and 6 of the former Thameslink service from via St Pancras. These are disused following the closure of the Moorgate branch from Farringdon junction as part of the Thameslink Programme and are now used for storage. The Northern line of the Underground uses platforms 7 and 8, which are in a deep level tube section of the station. Because of this, Moorgate is part of the London station group and accepts tickets marked "London Terminals". London Buses routes 21, 43, 76, 100, 141 and 153 serve the station.

The station was opened as Moorgate Street by the Metropolitan Railway as the first eastwards extension from the original terminus at Parliamentary power had been obtained to build a station at Moorgate in 1861, two years before the initial section, and it was completed on 23 December 1865. Increased traffic from other companies, including goods traffic from the Great Northern Railway, led to the line between King's Cross and Moorgate being widened to four tracks; the route was called the City Widened Lines and included a new tunnel at Clerkenwell which was 16 feet (5 m) lower than the original. The Widened Lines were open from Moorgate to Farringdon on 1 July 1866, and to King's Cross on 17 February 1868. Suburban services from the Midland Railway ran via Kentish Town and the Great Northern Railway ran via King's Cross. In 1874, director of the Metropolitan, Edward Watkin, described Moorgate Street as "your great terminus" and recommended a 100 bedroom hotel should be built on top of the station. The now Northern line platforms were originally part of an extension of the City & South London Railway (C&SLR) beyond towards , forming the northern terminus of its services from south of the River Thames. An act for the extension had been authorised in 1893 and included an eastern diversion of the original line underneath the Thames. The new station opened on 25 February 1900. The line was extended to Angel on 17 November the following year. The Northern City Line to Moorgate was opened by the Great Northern & City Railway (GN&CR) on 14 February 1904 offering a service to It had an escalator connection to the other Moorgate platforms. The route was constructed in tube tunnels, but they were constructed at a diameter capable of accommodating main line trains (in contrast to the majority of London tube tunnels which are much smaller). The line was the first to use automatic signalling throughout its length without any moving parts. Though a popular route, it went into decline after the Metropolitan Railway purchased the route on 1 July 1913. Consequently, the planned through services to the Great Northern Railway's main line were never implemented. The CS&LR line (taken over by the Underground Group in 1913) closed services between Moorgate and on 9 August 1922 in order to widen tunnels to 11 feet (3 m). The section from Moorgate to Clapham Common was worked on during the night while daytime services remained running, but closed completely on 28 November 1923 following a roof collapse at Newington Causeway the day before. Services to Euston opened on 20 April 1924, along with a connection to and stations further north. Services to Clapham Common resumed on 1 December. The station was renamed from Moorgate Street to Moorgate on 24 October that year.

British Rail services to Moorgate were initially steam operated. A commemorative service ran on 6 June 1971 from Moorgate to the depot at Neasden, powered by a 0 6 0 tank locomotive. Steam was replaced by Cravens built diesel multiple units and British Rail Class 31 locomotives class hauling non corridor stock which remained in operation until 1976, when it was replaced with British Rail Class 313 electrics. The Northern City Line connection for Moorgate to Finsbury Park tube was closed beyond Drayton Park on 5 October 1964 to allow work on the Victoria line. The line never re opened fully, but instead the line was connected to the Finsbury Park British Rail station, in order to provide a connection for suburban services into Moorgate. The new service opened on 1 September 1968. Moorgate station was completely modernised at platform level and street level in the 1960s, and the Widened Lines part of the station was extended to six platforms. The realignment of the platforms enabled about of the line to Barbican to be straightened and moved south to facilitate development of the Barbican Estate. British Rail (Eastern Region) took over control of the Northern City Line from London Underground in 1975, as part of the Great Northern lines suburban electrification. The Highbury Branch of the Northern line was terminated. Services from Finsbury Park to Moorgate were diverted to the Northern City Line from the City Widened Lines the following year. The City Widened Lines were renamed the Moorgate line when overhead electrification was installed in 1982, allowing the Midland City Line service to run from Bedford via the Midland Main Line to Moorgate. This later formed a branch of the Thameslink route. The Moorgate Thameslink branch was reduced to peak hours services only in 2003, and closed permanently on 20 March 2009 as part of the Thameslink Programme upgrades. The closure was required in order to lengthen the platforms at Farringdon to take the longer trains, which could only be done southward in the direction of Moorgate as there was too steep a gradient to the north. Under Crossrail works, the western ticket hall of the Elizabeth line station at was constructed just east of Moorgate station. This linked the Northern line platforms at Moorgate to the Central line at Liverpool Street via the Elizabeth line platforms spanning the two. The refurbished entrance on Moorfields opened on 5 July 2021. Upon opening, this provided step free access to the Circle, Hammersmith and City and Metropolitan line platforms, and later to the Northern line and Elizabeth line when the new line opened on 24 May 2022.

On 13 September 1905, a train derailed at the station. There were two injuries. On 28 February 1975, 43 people were killed and 74 seriously injured in the Moorgate tube crash, when a southbound Northern City Line train crashed into the end of the dead end tunnel beyond the platform. The accident caused the most fatalities on the Underground during peacetime and has been considered the worst ever on the system. The cause was the unexplained failure of the driver to stop or even slow down at the platform, causing the train to run at speed into the dead end tunnel, colliding with the buffers and then with the wall. Services were immediately suspended, resuming on 1 March from Drayton Park to Old Street only. The wreckage was not fully cleared until 6 March and the station fully re opened four days later.

Trains using the deep level Northern City Line platforms (9 and 10) are supplied with 750 V DC current via the third rail, overseen by York Electrical Control Room. The shield was used to dig part of a very short planned extension south to Lothbury, quickly abandoned.

The Metropolitan, Hammersmith & City and Circle lines serve the station between Barbican to the west and Liverpool Street to the east. All three lines share the same pair of tracks from Baker Street Junction to Aldgate Junction.