Question: Which rail service serving the Blue Mountains region of New South Wales, Australia  has the Blacktown railway station? 

Context paragraphs:
Woodford, New South Wales: Woodford is a village in the Blue Mountains in New South Wales, Australia, approximately 90 kilometres west of Sydney.  Its elevation is 609 m above sea level.  It is situated on the Great Western Highway and has a railway station (opened in 1868 as Buss's Platform) on the Main Western railway line served by NSW TrainLink's Blue Mountains services.  At the 2006 census , Woodford had a population of 1,967.

Wentworth Falls, New South Wales: Wentworth Falls (postcode: 2782) is a town in the Blue Mountains region of New South Wales, situated approximately 100 km west of the Sydney central business district, and about 8 km east of Katoomba, Australia on the Great Western Highway, with a Wentworth Falls railway station on the Main Western line.  The town is at an elevation of 867 m   .  At the 2011 census , Wentworth Falls had a population of .

Blue Mountains National Park: The Blue Mountains National Park is a protected national park that is located in the Blue Mountains region of New South Wales, in eastern Australia.  The 267954 ha national park is situated approximately 80 km west of Sydney, and the park boundary is quite irregular as it is broken up by roads, urban areas and inholdings. Despite the name 'mountains', the area is an uplifted plateau, dissected by a number of larger rivers.  The highest point in the park is Mount Werong at 1215 m above sea level; while the low point is on the Nepean River at 20 m above sea level as it leaves the park.

Lapstone Zig Zag: The Lapstone Zig Zag was a zig zag railway built near Lapstone on the Great Western Railway of New South Wales in Australia between 1863 and 1865, to overcome an otherwise insurmountable climb up the eastern side of the Blue Mountains.  The ruling grade was already very steep at 1 in 33 (3%).  Another of the early plans had been to build the whole line across the Blue Mountains on a completely different route through the Grose Valley with a 3 km long tunnel, but this was beyond the resources of the colony of New South Wales at the time.  The track included a now abandoned station called "Lucasville" which was built for the Minister for Mines, John Lucas who had a holiday home nearby.

Linden, New South Wales: Linden is a village in the Blue Mountains of New South Wales, Australia.  It is in the City of Blue Mountains, 81 km west of Sydney and 19 km east of Katoomba.  The village is on the Great Western Highway and has a railway station on the Main Western railway line served by NSW TrainLink's Blue Mountains Line.  It shares a post office, and therefore the 2778 postcode, with adjoining Woodford.  In the 2011 census , its population was 594, including 19 indigenous people (3.2%).

Blue Mountains Line: The Blue Mountains Line is an intercity rail service operated by NSW TrainLink serving the Blue Mountains region of New South Wales, Australia.  The line travels west from Sydney to the major town of Katoomba and on to Lithgow on the western foothills of the mountains.  2 Express services per day in each direction, known as the 'Bathurst Bullet extend to the regional city of Bathurst, which is supplemented by road coaches connecting Bathurst to Lithgow.  The Blue Mountains Line operates over a mostly duplicated section of the Main Western line.  As such, the tracks are also traversed by the "Central West XPT", "Outback Xplorer" and "Indian Pacific" passenger services and by freight trains.

Blue Mountains (New South Wales): The Blue Mountains is a mountainous region and a mountain range located in New South Wales, Australia.  The region borders on Sydney's metropolitan area, its foothills starting about 50 km west of the state capital.  The public's understanding of the extent of the Blue Mountains is varied, as it forms only part of an extensive mountainous area associated with the Great Dividing Range.  Officially the Blue Mountains region is bounded by the Nepean and Hawkesbury rivers in the east, the Coxs River and Lake Burragorang to the west and south, and the Wolgan and Colo rivers to the north.  Geologically, it is situated in the central parts of the Sydney Basin.

Blacktown railway station: Blacktown railway station is located on the Main Western line, serving the Sydney suburb of Blacktown.  It is served by Sydney Trains T1 Western Line and T5 Cumberland Line services and NSW TrainLink Intercity Blue Mountains Line and regional "Central West XPT" services.

Bell, New South Wales: Bell (postcode: 2786) is a small rural and residential village in the Blue Mountains region of New South Wales, Australia.  It is the north-westernmost village in the City of Blue Mountains, located approximately 125 km west of Sydney central business district by road or 137 km by rail, approximately 20 km east of Lithgow and 10 km north of Mount Victoria.  It is a locality on the junction of the Bells Line of Road, Chifley Road and the Darling Causeway, with an elevation of approximately 1100 m   .

Eucalyptus stricta: Eucalyptus stricta, commonly known as Blue Mountains mallee ash, is a small eucalyptus plant mostly seen growing in the Blue Mountains region in central eastern New South Wales.  A mallee grows up to 5 metres tall, but is usually seen much smaller.  It is a common plant in poorly drained, shallow sandy soils, in areas frequented by fire.  The narrow leaves and multistemmed mallee habit make this plant easily noticed in the Blue Mountains.

Supporting paragraphs: Blacktown railway station Blue Mountains Line
Answer: Blue Mountains Line