This junction was for the Rough Castle Branch (Caledonian Railway). The junction was on the west side of the Forth and Clyde Canal from Carmuirs West Junction.
The branch was a single track line. It left the double track main line to run east to several works including the Camelon Iron Works. The signal box (1887) opened on the south side of the line. The railway was in a cutting here and the box was at the top of the bank on the south side, probably for a clear view as a small aqueduct crossed the line at the junction. The box was to the west of the aqueduct (and road bridge which is alongside).
The connection was taken out in 1936 and the box closed. There was another connection to the works lines from Roughcastle Junction. The works sidings remained open until about 1970.