On 4 September, the Helsinki City Rescue Department gave Länsimetro Oy permission to hand over the Koivusaari and Lauttasaari stations to HKL for preparations related to the start-up of metro services. On 31 August, the Länsi-Uusimaa Department for Rescue Services gave its permission regarding the six stations located in Espoo. Passenger traffic started the 18th of November, 2017.
The Matinkylä–Kivenlahti section is currently being excavated. The excavation work began in late 2014. Almost 95 per cent of the tunnels have been excavated.