The line formerly included an additional kilometre of track to Gracefield Freight Terminal, where it connected to a network of industrial sidings in nearby Seaview.

Following land reclamation in the 1950s & 1960s, an extensive network of sidings was built at Seaview to serve industrial interests, including the Ford Motor Vehicle Assembly Plant; oil terminals for BP, Caltex, Europa and Shell; Pacific Scrap; and the Ministry of Works.

The catenary was extended slightly in 1959-60 to allow for EMUs running race trains to Hutt Park to use a workshops siding.

[1] From the time the line opened to the 1940s, steam trains were used to convey patrons to race meetings and picnics at the Hutt Park Raceway via Woburn.

A twice-daily workers' train between Wellington and the Hutt Workshops conveyed railwaymen to and from work from the 1930s to December 1982, and was the last regular passenger service run on the line.

[13] The only regular traffic that currently uses the line is the Hutt Workshops shunt (Q4) which normally operates thrice weekly, with occasional special services.