Question: Who manages the station that serves a small town and civil parish in the Borough of Pendle Lancashire, England with a population of 8,200 as of 2011?

full_context: Document 1: Brierfield, Lancashire: Brierfield is a small town and civil parish in the Borough of Pendle Lancashire, England. It is 2.5 mi north east of Burnley, 1 mi south west of Nelson, and 0.5 mi north east of Reedley. It has a population of 8,200, reducing marginally to 8,193 at the 2011 Census.
Document 2: Brierfield railway station: Brierfield railway station serves the small town of Brierfield, Lancashire, England and is on the East Lancashire Line 2+1/4 mi east of Burnley Central railway station towards Colne (the terminus). The station is managed by Northern, who also provide all passenger trains serving it.
Document 3: Darwen railway station: Darwen railway station serves Darwen, a town in Lancashire, England. It was opened in 1847 by the "Bolton, Blackburn, Clitheroe & West Yorkshire Railway", which was subsequently taken over by the Lancashire and Yorkshire Railway twelve years later. It is now served by Northern services on the Ribble Valley Line from Manchester Victoria/Bolton to Blackburn and into Clitheroe.
Document 4: Smallbridge, Greater Manchester: Smallbridge is a district of Rochdale in Greater Manchester, England. It lies at the foothills of the Pennines, in the northeast of Rochdale, contiguous with Buckley, and to the south of the village of Wardle. The Rochdale ward is called Smallbridge and Firgrove. This ward had a population of 11,469 at the 2011 Census.
Document 5: Clitheroe railway station: Clitheroe railway station serves the town of Clitheroe in Lancashire, England. The station is the northern terminus of the Ribble Valley Line operated by Northern and is 10 mi north of Blackburn. The station forms part of Clitheroe Interchange, which has won a number of awards.
Document 6: Padiham: Padiham is a small town and civil parish on the River Calder, about 3 mi west of Burnley and south of Pendle Hill, in Lancashire, England. It is part of the Borough of Burnley, but has its own town council with varied powers. Padiham was originally a rural village lying by the River Calder. It is still surrounded by attractive countryside on an arc running from the north-west to the north-east in the foothills of Pendle Hill.
Document 7: East Lancashire Railway: The East Lancashire Railway is a 12+1/2 mi heritage railway line in north west England which runs between Heywood and Rawtenstall with intermediate stations at Bury Bolton Street, Burrs Country Park , Summerseat, Ramsbottom and Irwell Vale.
Document 8: Burrs Country Park railway station: Burrs County Park is the East Lancashire Railway's seventh station. It was opened in October 2016
Document 9: Accrington: Accrington is a town in the Hyndburn borough of Lancashire, England. It lies about 4 mi east of Blackburn, 6 mi west of Burnley, 13 mi east of Preston, 20 mi north of Manchester city centre and is situated on the mostly culverted River Hyndburn. Commonly abbreviated by locals to "Accy", the town has a population of 54,800 according to the 2001 census and the urban area has a population of over 85,000.
Document 10: Earby: Earby is a small town and civil parish within the Borough of Pendle in Lancashire, England. It is 5 mi north of Colne, 7 mi south-west of Skipton, and 11 mi north-east of Burnley. The parish had a population of 6,183 recorded in the 2011 census,
Document 11: Whalley railway station: Whalley railway station serves the village of Whalley in Lancashire, England. The station lies on the Ribble Valley Line 7+1/4 mi north of Blackburn. The station has two platforms, slightly offset from each other. It is unstaffed, with shelters on each platform. Immediately beyond its eastern end, the line crosses the River Calder on a 678 yd long, brick viaduct of 48 arches.
Document 12: Poulton-le-Fylde railway station: Poulton-le-Fylde railway station serves the town of Poulton-le-Fylde in Lancashire, England. It is managed by Northern, but also served by Virgin Trains and is 14+1/4 mi northwest of Preston.
Document 13: Brierley Hill: Brierley Hill is a small town and electoral ward of the Dudley Metropolitan Borough, in the West Midlands of England, and is situated approximately 2.5 miles south of central Dudley and 2 miles north of Stourbridge. Part of the Black Country, and in a heavily industrialised area of the Dudley Borough, it has a population of 13,935 at the 2011 census, and is best known for glass and steel manufacturing, although the industry has declined considerably since the 1970s. One of the largest factories in the area was the Round Oak Steelworks, which was closed down and redeveloped in the 1980s to become the Merry Hill Shopping Centre. Brierley Hill was originally in Staffordshire, but is now part of the West Midlands metropolitan county since its creation in 1974.
Document 14: Colne railway station: Colne railway station serves the Lancashire mill town of Colne, England, which is situated close to Pendle Hill. The station, which is managed by Northern, is the eastern terminus of the East Lancashire Line. Trains from Blackpool South run through Preston and Blackburn to Burnley and Colne.
Document 15: Pendle Hill: Pendle Hill is located in the east of Lancashire, England, near the towns of Burnley, Nelson, Colne, Clitheroe and Padiham. Its summit is 557 m above mean sea level. It gives its name to the Borough of Pendle. It is an isolated hill, separated from the Pennines to the east, the Bowland Fells to the northwest, and the West Pennine Moors to the south. It is included in detached part of the Forest of Bowland Area of Outstanding Natural Beauty (AONB).
ground_truth: Northern