Question: What railway line does one have to travel to get from Lincoln Central railway station to Doncaster?

Context paragraphs:
Regent Street railway station: Regent Street railway station, formerly known as Mortuary railway station, was a railway station on Sydney's Rookwood Cemetery railway line.  Funeral trains departed from the station, bound for Rookwood Cemetery.  The station found later use as a part of Sydney Yard.  The ornate Gothic building is still standing on the western side of Sydney Yard at Chippendale, close to Central railway station and Railway Square.

Doncaster–Lincoln line: The Doncaster–Lincoln line is a railway line in England.  It runs from the East Coast Main Line at Doncaster south east to Lincoln.

Badnera Junction railway station: Badnera railway station serves Badnera in Amravati district in the Indian state of Maharashtra.  It is a junction station on the Howrah-Nagpur-Mumbai line.  There is a broad gauge line to Narkhed.  Today, Badnera is a part of Amravati Municipal Corporation.  City buses are also available from this Railway station to many area of Amravati city.  This is one of major junctions on the Mumbai Howrah Railway Line.  Badnera is crew change point for all goods Trains plying Bhusaval Nagpur Line addition to that some Express Trains gets crew change here as well.  Badnera is last station of Bhusaval Division of Central Railway so, many express trains get slack time here so reached Badnera Right time.  There is one Branch line for Amravati which is for 9 km one of shortest branch lines in India.  Badnera, New Amravati Railway station are in Amravati Municipal Corporation, so connected well with Amravati city.  Trains starting from Amravati to Nagpur does not touch Badnera due Chord line which eliminates Reversal at Badnera.51262 Wardha Amravati Passenger halt here for 110minutes, 51198 Wardha Bhusaval Passenger halt here for 85 min which is very rare in Indian Railways in terms of halt time.

Dharmabad railway station: Dharmabad railway station is a railway station belonging to Hyderabad railway division of South Central Railway.  The station is situated in Nanded district of Maharashtra, India.  Its station code is DAB.  The station is on a single track non-electrified broad gauge line.  There is a demand to transfer this railway station from South Central Railway zone to Central Railway zone.

KTM East Coast Railway Line: The East Coast Railway Line is the single track metre gauge runs between Gemas railway station, in Negeri Sembilan and Tumpat railway station, in Kelantan of Malaysia.  Gemas is the rail junction between the West Coast line and East Coast railway line.  Like the West Coast Railway Line, it is called the East Coast Railway Line (Malaysia) because it serves two of Peninsular Malaysia's East Coast states, namely Pahang and Kelantan.  In fact, it does not run along the coast at all and only meets the South China Sea when it terminates in Tumpat railway station.  It runs through the interior, often through deep jungle, thus earning the nickname Jungle Railway.  Terengganu is the only state in Peninsular Malaysia not served by the KTM railway network.

Matale railway station: Matale Railway Station is the terminus railway station on the Matale railway line of Sri Lanka.  It is the 65th railway station on the line from Colombo Fort railway station and is located in the Matale District in the Central Province.  It is 148.6 km from the Colombo Fort Railway Station and 27.64 km from the Kandy Railway Station. it's the end of railway line, because of water flowing beneath the ground, railway lines cannot be constructed beyond matale.

Lincoln Central railway station: Lincoln Central railway station serves the city of Lincoln in Lincolnshire, England.  The station is owned by Network Rail and managed by East Midlands Trains (EMT) train operating company.  EMT provide services along with Northern and Virgin Trains East Coast.

Bihar Sharif Junction railway station: Bihar Sharif Junction railway station, station code BEHS, is a railway station and under Danapur railway division of East Central Railway.  Bihar sharif is connected to metropolitan areas of India, by the Delhi-Kolkata Main Line via Mugalsarai-Patna route.  Station is located in Bihar sharif city in Nalanda district in the Indian state of Bihar.  Due to its location on the Bakhtiyarpur-tilaiya main line many Patna and other cities via express trains coming from Rajgir and Gaya Junction stops here.  Bihar Sharif has well connected trains running frequently to New Delhi railway station, Patna Junction, Varanasi Junction railway station, and Howrah Junction railway station.  Bihar Sharif is well connected with Gaya Junction, Rajgir railway station, Tilaiya railway station, Bhagalpur railway station, and Kiul Junction through daily passenger and express train services.

Fallowfield Loop railway line: The Fallowfield Loop railway line was a local railway route in Greater Manchester, England.  Trains on the Manchester, Sheffield and Lincolnshire Railway (MS&LR) line (later, the Great Central Railway line) from Sheffield Victoria and Guide Bridge used the Loop to access Manchester Central railway station.  Some express trains including the Harwich-Sheffield-Manchester-Liverpool boat train used the line.

Kilnhurst Central railway station: Kilnhurst Central was a railway station in Kilnhurst, South Yorkshire, England, one of two railway stations serving the village, the other being Kilnhurst West, situated on the North Midland Railway line.  Kilnhurst Central was on the former Great Central Railway's (GCR) Sheffield Victoria - Doncaster line, between Parkgate and Aldwarke and Swinton Central.

Supporting paragraphs: Doncaster–Lincoln line Lincoln Central railway station
Answer: East Coast Main Line