Note: text in square brackets is added for clarity and was not part of the location's name.
Opened on the Glasgow, Paisley, Kilmarnock and Ayr Railway.This junction was taken out in 1937. (The iron works had closed in the 1920s, but the steel works remained open.)
The junction originally opened as the iron siding for Glengarnock Iron Works. It provided a northern approach to the blast furnaces.
A signal box was opened (date assumed 1882) to control the junction.
With the opening of the line via Kilbarchan the box was renamed from Glengarnock Signal Box to Glengarnock No 1 Signal Box, to avoid confusion with the renamed Kilbirnie Signal Box (which became Glengarnock No 2 Signal Box).
The connection and box closed in 1937, and the No 2 box was renamed to Glengarnock Signal Box.