Question: What was Sedgebrook railway station formerly?

Context paragraphs:
Kolkata railway station: Kolkata railway station formerly known as Chitpur Station, is the newest of the four intracity railway stations serving Howrah and Kolkata, India; the others are Sealdah Station, in Kolkata, Shalimar Station in Howrah and Howrah Station in Howrah, Santragachi Junction railway station in Howrah.  Kolkata station is situated in the Chitpur locality of north central Kolkata.

Sedgebrook railway station: Sedgebrook railway station was formerly a station on the Nottingham to Grantham line, which opened as the Ambergate, Nottingham, Boston and Eastern Junction Railway on 15 July 1850.  The line was leased to the Great Northern Railway in 1855, but remained nominally independent until it was taken over by the London and North Eastern Railway in 1923.  The station was closed in 1956.

Acton GO Station: Acton GO Station is a railway station served by GO Transit's Kitchener line.  It is located at the intersection of Mill St East and Eastern Avenue in Acton, Ontario, Canada, adjacent to the "Old Hide House".  A previous Acton station formerly stood on the Grand Trunk Railway and, later, the Canadian National Railway.

Ashbourne railway station: Ashbourne railway station formerly served the town of Ashbourne in Derbyshire.  There have been two stations in the town.  The first, opened in 1852, was operated by the North Staffordshire Railway (NSR); it was replaced in 1899 by a station at a new location, jointly operated by the NSR and the London and North Western Railway (LNWR).  In 1923 the station passed into the ownership of the London, Midland and Scottish Railway and in 1948 that of the London Midland Region of British Railways.  It was finally closed to all traffic in 1963 (regular passenger services having been withdrawn in 1954).

Old Townsville railway station: Old Townsville railway station formerly the Great Northern railway station, is a three-storey, red brick structure on Flinders Street in Townsville CBD, Queensland, Australia.  The original terminus for The Great Northern Railway, the station became an important in the economic growth of Townsville during the early 20th century.  The building is featured in a number of famous photos taken at celebrations of victory following World War II.  A new station to service Townsville was built in the early 21st century and the platform is used for displays of historical photographs and articles.  The building still houses Queensland Rail administrative offices.

Hilal railway station: Hilal railway station formerly Istravoz railway station is a railway station located in İzmir, Turkey.  It is located east of Basmane next to the famous Hilal Junction on the Izmir-Afyon railway.  The station was famous for being located next to the only level crossing in Turkey.  The Oriental Railway Company's Alsancak-Aydın Main Line crossed with the Smyrna Cassaba Railway's Basmane-Afyon Main Line.  Due to the layout of the tracks, the station was first named "Istravoz railway station" in 1866.  "Istravoz" (from Greek σταυρóς) means Cross in Turkish.  After the Republic of Turkey was formed in 1923, the station's name was changed to "Hilal" which means 'crescent', due to the majority of the city's population being Muslim.  The Hilal subway station, which opened in 2000, is located adjacent to the railway station.  When the electrification of the tracks around İzmir started in 2001, the station was closed.

Helensville railway station: The Helensville railway station formerly served the town of Helensville, 40 kilometres northwest of Auckland in the North Island of New Zealand.  It was a stop on the North Auckland Line, and was the next major station north of Waitakere.  At one time it was called the Hellensville North Railway Station.

Grantham railway station: Grantham railway station serves the town of Grantham in Lincolnshire, England and lies on the East Coast Main Line (ECML) 105.5 mi north of London King's Cross.

Dixon Fold railway station: Dixon Fold railway station was built on the Manchester and Bolton Railway, between Clifton Junction railway station (Manchester to Preston Line) and Kearsley railway station, in Clifton near Pendlebury.  It opened in 1841.  Maps of the area from 1848 give it the name "Clifton Station", which should not to be confused with the nearby Clifton railway station on Rake Lane (formerly named Clifton Junction railway station), which opened in 1847.  The station closed between 2 August 1926 and 7 March 1927, but was closed permanently on 18 May 1931.  The station was demolished after closure.

Nákladové nádraží Žižkov: Praha-Žižkov freight railway station (Czech: "nákladové nádraží Žižkov" ) is a railway station formerly used for rail freight transport, located in the Žižkov district of Prague, the capital of the Czech Republic.  It was originally opened in 1936 and ceased operations in 2002.  The station building was confirmed as a cultural monument in March 2013.

Supporting paragraphs: Sedgebrook railway station Grantham railway station
Answer: Grantham railway station