Originally planned to be completed by the end of 2021, Alkimos station and the Yanchep Rail Extension opened on 14 July 2024.

It is located north of Romeo Road and east of Marmion Avenue in an area undeveloped at the time of construction.

[7] Alkimos and Eglinton combined are planned to have a population of 60,000 when they are fully developed, and the land around the station, known as Alkimos Central, is planned to become a city centre for the surrounding area, with 15,000 jobs.

[8][9][10] On the station's interior concourse is an artwork titled Moon Over Ocean, Land Under Sun, by Caroline Christie-Coxon.

[11] On the ceiling is an artwork by Jarni McGuire representing the mythical Rainbow Serpent and inspired by the Melaleuca paperbark tree.

On the platform walls is a mural by Chris Nixon using horizontal lines to represent the coastline and waves washing up on the beach.

[23] In December 2019, the main contract for the Yanchep Rail Extension and the Thornlie–Cockburn Link was awarded to the NEWest Alliance, a joint venture of CPB Contractors and Downer Group.

[27] By May 2022, the retaining walls were complete and backfilling was ongoing[29] and by October 2022, construction of the platform and concourse had begun.

[31] The station's four escalators had been installed by May 2023,[32] and by June 2023, the structural steel was complete and work on the roof was ongoing.

[34] By March 2024, the station's structure was complete and internal fittings and furniture was being installed.

[36][37][38] After the May 2023 state budget, the government said that the Yanchep extension "is due for completion at the end of 2023, with services commencing in the new year".

[39] At the end of 2023, the Yanchep extension was still under construction and services were planned to commence in the first half of 2024.