[4] The line was not used for passenger traffic[3] and had originally been built to serve the Newbie Brick and Tile Works,[1] but that business had closed when the clay quarry was exhausted and the track lifted by 1929.

[9] As stated this mineral branch was served by trains from the west and the junction was circa 73 miles (117 km) from Kilmarnock railway station.

The 1929 OS map shows a signal box located opposite Newbie Junction on the northern side of the line.

The large factory site is partly camouflaged by tree plantations and some unused track remains in situ within the works itself.

Doon Valley Railway volunteers lifted the track from near the junction to the Old Mill Bridge in 1983 for use at their Dunaskin site and Cochran's Ruston and Hornsby 0-4-0 diesel shunter, nicknamed 'Blinkin Bess', is now located at the railway's Dunaskin base in the Doon Valley.