The current Robin Hood line around Kirkby in Ashfield causes confusion - it actually touches upon 3 different railway alignments. Where the current Robin Hood line station is (named Kirkby in Ashfield, but in the railway's internal systems as Kirkby Central to this day, despite not being where that station was located either
) is on the former Great Northern Railway route. This is achieved by leaving the Midland Railway route after Kirkby Tunnel, climbing steeply over the old Great Central Railway alignment for a matter of yards and via a number of tight curves achieving the old GN alignment which BR had used after abandoning the old MR route in the hope of selling it for development.
By a further series of curves it then regains the old Midland route around Sutton Parkway/Sutton Junction.