The original junction for the Galston branch was north of Hurlford station, the branch passing round a third platform, the southbound main line platform being an island. In addition to being the junction for Galston there was also a line east to the Portland Iron Works and west to Bellfield Colliery - both served from the north.
The junction was modified to south of the station.
Hurlford North Signal Box opened in 1876. It was located on the east side just south of the River Irvine Bridge. It was renamed Hurlford No 1 box. The Portland Iron Works was closed by the 1890s. The box closed in 1934.
The main line remains open.