The collieries at Ashington, originally served by a branch from Pegswood, developed to form a large private railway system.
This system started with a branch from Pegswood (station not yet opened at the time) to Ashington. This was connected to the Newbiggin Branch (Blyth and Tyne Railway) at Ashington. The system extended north to serve Linton, Ellington and Lynemouth. Later additions were the Linton to Butterwell to the Newcastle and Berwick Railway line and the Lynemouth to Newbiggin line.
This line is divided into a number of portions.