Holmlia is served by the L2, L2x and L21 lines of the Oslo Commuter Rail, providing three to five services per hour.

Holmlia has since become among the country's busiest commuter stations, resulting in a northern accessway being built in 2012.

The ground conditions were poor through Holm and the Norwegian State Railways therefore decided to build a new rote via Hauketo.

[2] The line past the station received double track on 15 December 1936, followed by electrification on 18 January 1937.

Instead focus was on larger platforms to handle many travelers, better access and large roofed areas where passengers could wait.

Arne Henriksen at NSB Arkitektkontor was selected as the head architect, and Holmlia became his breakthrough.

The Norwegian National Rail Administration therefore decided to also build an access structure to the northern side of the platforms.

As the superstructure is listed, the work largely consisted of retouching the existing design, as well as adding an elevator.

The unique design of the station has made it a local landmark and it has been featured among other things in a borough logo.

[8] The northern part has an access superstructure made of steel and hardened glass, chosen to be resistant against vandalism.

[13] In addition, the L21 services, which run otherwise direct from Oslo to Ski and onward along the Eastern Østfold Line, call at Holmlia once per hour.

[16] Despite the double track, the Østfold Line past Holmlia has reached its capacity limitation due to the mix of commuter, regional and freight trains.

It will allow regional trains to bypass the Østfold Line between Oslo and Ski, freeing up capacity.