It connects Helsinki-Vantaa Airport and the adjacent Aviapolis business and retail district to the Helsinki commuter rail network.

The line fills the gap between Vantaankoski and Tikkurila railway stations, travelling in tunnel underneath the airport.

The founding stone of the line was laid on 3 March 2009,[1] and construction was started on 13 May 2009 with the excavation of service tunnels.

[3] In September 2012, the opening date was pushed back to July 2015, due to the unexpected need to re-design and reinforce the airport station tunnel to withstand the acidic products of propylene glycol decay by bacteria within the ground.

[6] The new line creates a connection from the airport to Helsinki Central railway station, as well as the suburban areas on the route.