What railway line does one have to travel to get from Lincoln Central railway station to Doncaster?
Doncaster–Lincoln line: The Doncaster–Lincoln line is a railway line in England. Doncaster–Lincoln line:  It runs from the East Coast Main Line at Doncaster south east to Lincoln. Lincoln Central railway station: Lincoln Central railway station serves the city of Lincoln in Lincolnshire, England.
East Coast Main Line