Question: What was Sedgebrook railway station formerly?

full_context: Document 1: Grantham railway station, Queensland: Grantham railway station was a railway station on the Main Line railway in Queensland, Australia. It served the town of Grantham in the Lockyer Valley Region.
Document 2: Gainsborough Lea Road railway station: Gainsborough Lea Road railway station is one of two stations that serve the town of Gainsborough in Lincolnshire, England, the other station being Gainsborough Central, which is located in the town centre. The station is managed by East Midlands Trains and is located 14.25 mi northwest of Lincoln Central on the A156 Lea Road in the south of the town. The station opened in 1867 on a single line of the Great Northern Railway, who ran four trains a day from Gainsborough to Lincoln.
Document 3: 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.
Document 4: 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 It was finally closed to all traffic in 1963 (regular passenger services having been withdrawn in 1954).
Document 5: East Coast Main Line: The East Coast Main Line (ECML) is a 393 mi major railway link between London and Edinburgh via Peterborough, Doncaster, Wakefield, Leeds, York, Darlington and Newcastle, electrified along the whole route. Services north of Edinburgh to Aberdeen and Inverness use diesel trains. The main franchise on the line is operated by Virgin Trains East Coast.
Document 6: Doncaster railway station: Doncaster railway station serves the town of Doncaster, in South Yorkshire, England. It is situated on the East Coast Main Line 156 mi north of London King's Cross and managed by Virgin Trains East Coast. It is a major passenger interchange between the East Coast Main Line and Cross Country Route and local services running across the North of England. It is also the point for which Virgin Trains East Coast services from London divide, either branching off to Leeds or continuing north to Scotland via Newcastle and the North East.
Document 7: Habrough railway station: Habrough railway station serves the village of Habrough and the town of Immingham in North East Lincolnshire, England. It was built by the Great Grimsby and Sheffield Junction Railway in 1848. Up until 1988 there was a signal box at the station on the south side of the track and east side of the road with manually-operated gates. It was of typical Great Central Railway signal box design. The main buildings were located on the eastbound platform and were linked to the westbound one via a footbridge, but both have also been demolished and the crossing is now automatic.
Document 8: Great Northern Route: The Great Northern Route (formerly known as Great Northern Electrics) is the name given to suburban rail services run on the southern end of Britain's East Coast Main Line and its associated branches. Services operate to or from London King's Cross and Moorgate in London. Destinations include Hertford North , Welwyn Garden City , Stevenage , Peterborough , Cambridge and King's Lynn . Services run through parts of Greater London, Hertfordshire, Bedfordshire, Cambridgeshire and Norfolk.
Document 9: Stevenage railway station: Stevenage railway station serves the town of Stevenage in Hertfordshire, England. The station is 27 mi north of London King's Cross on the East Coast Main Line. Stevenage is managed and served by Great Northern. It is also served by Hull Trains and Virgin Trains East Coast.
Document 10: Frodingham railway station: Frodingham railway station was a railway station in Frodingham, Lincolnshire, England. It was open by the Trent, Ancholme and Grimsby Railway on 1 October 1866 and, like all the others built by that company, had staggered platforms set around the level crossing on the Brigg Road. The first station here was closed in autumn 1886, when a new Frodingham station, built by the Manchester, Sheffield and Lincolnshire Railway, was opened, to the west of the Brigg Road level crossing. This station was suffixed "and Scunthorpe" at some date and was closed in 1928, when the LNER opened a new station which it named Scunthorpe nearer to the town centre.
Document 11: West Coast Main Line: The West Coast Main Line (WCML) is one of the most important railway corridors in the United Kingdom, connecting the major cities of London, Birmingham, Glasgow, Liverpool and Manchester. It is one of the busiest mixed-traffic railway routes in Europe, carrying a mixture of intercity rail, regional rail, commuter rail and rail freight traffic. The core route of the WCML runs from London to Glasgow, with branches diverging to Birmingham, Manchester and Liverpool, totalling a route mileage of 700 mi . Services from London to North Wales and Edinburgh also run via the WCML; however the main London-Edinburgh route is the East Coast Main Line. In addition, several sections of the WCML form part of the suburban railway systems in London, Birmingham, Manchester and Glasgow, with many more smaller commuter stations, as well as providing links to more rural towns.
Document 12: Scrooby railway station: Scrooby was a railway station on the Great Northern Railway running between Retford and Doncaster. The station served the small village of Scrooby until closed in 1931, though an excursion stopped in 1938. Sunday trains ended in 1924. In 1897 it had a booking office, waiting room, stationmaster's house, signal box and 5 passenger trains a day each way, but no goods facilities. About 1978 the signal box was replaced by Doncaster power box.
Document 13: 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.
Document 14: Leaton railway station: Leaton railway station was a minor station located about six miles north of Shrewsbury on the GWR’s Paddington to Birkenhead main line. Today this is part of the Shrewsbury to Chester line. It was at the top of the long climb up Hencote bank out of Shrewsbury. The station opened on 12 October 1848 and closed on 12 September 1960. The station building (now a private house) can still be seen on the north side of the adjacent Leaton level crossing on the east side of the line.
Document 15: Caythorpe railway station: Caythorpe railway station was a station in Caythorpe, Lincolnshire. Built to serve the nearby village of the same name. It was on the Grantham to Lincoln line, between Honington junction and Leadenham, onwards to Navenby, Harmston, Waddington to Lincoln. The line was owned by the Great Northern Railway. The station closed in 1962 but the line closed in 1965 as part of the Beeching rationalisation of the UK railway system. The site now houses a recycling centre for household waste.
ground_truth: Grantham railway station