Question: Which organization manages the Colne and Blackpool South railway stations?

full_context: Document 1: 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 2: 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 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: Blackpool Pleasure Beach railway station: Blackpool Pleasure Beach railway station serves Blackpool Pleasure Beach theme park. It is the penultimate station before Blackpool South on the Blackpool South to Colne line. There are no free tickets or other concessions for passengers wishing to visit the Pleasure Beach. Pleasure Beach Station is located about 300 m from Burlington Road West tram stop on the Blackpool Tramway.
Document 5: 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 6: 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 7: Blackpool F.C.: Blackpool Football Club is a professional association football club based in the seaside town of Blackpool, Lancashire, England. For the 2017–18 season, they are competing in League One, the third tier of English football. Founded in 1887, Blackpool's home ground has been Bloomfield Road since 1901. Their main nickname is "the Seasiders", but they are also called "the 'Pool" and "the Tangerines", the last in reference to the colour of their home kit, which is often referred to as orange (but really tangerine).
Document 8: 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 9: 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).
Document 10: 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 11: St Annes-on-the-Sea railway station: St Annes-on-the-Sea railway station serves the town of St Annes-on-the Sea, commonly known as St Annes, which is part of the conurbation of Lytham St Annes in Lancashire, England. It is located on the Blackpool South to Preston railway line 3+1/4 mi south-southeast of Blackpool South.
Document 12: Hest Bank North Junction: Hest Bank North Junction is a railway junction in Lancashire, England, where the Morecambe Branch Line joins the former London and North Western Railway (LNWR) line (now the West Coast Main Line (WCML)) in the down direction between Lancaster and Carnforth. It is also known as Morecambe North Junction. This line is currently being considered to become a community railway. Hest Bank railway station was situated here until its closure on 3 February 1969. Little trace of the old station remains, the platforms having been demolished prior to the electrification of the line in 1973. It is also the only location on the entire 401 mile (643 km) WCML where the coastline and Irish Sea is visible from the railway.
Document 13: Squires Gate railway station: Squires Gate railway station serves the Squires Gate area of the popular seaside resort of Blackpool, Lancashire, England, although it is located just outside the borough boundary. It lies on the Blackpool South to Colne line and is the nearest station to Blackpool International Airport. Squires Gate is located about 400 m from Starr Gate tram stop on the Blackpool Tramway.
Document 14: Marion railway station: Marion railway station is located on the Seaford line. Situated in the south-western Adelaide suburb of Marion, it is 11.4 kilometres from Adelaide station.
Document 15: Blackpool South railway station: Blackpool South railway station serves the suburban south of the popular seaside resort of Blackpool, Lancashire, England. It is the terminus of the "South Fylde Line" 12+1/4 mi west of by rail, though most services run through from Colne. It lies only a short walk from Blackpool Football Club's stadium at Bloomfield Road. The station is managed by Northern, who operate all trains serving it. Blackpool South is located about 500 m from Waterloo Road tram stop on the Blackpool Tramway.
ground_truth: Northern