Speeds up to 320 km/h can apply to standard train solutions. It should be pointed out that in order to achieve efficiency in passenger transport, they should use their own high-speed line. The stations to be located after the track do not have the same destinations as for passenger transport.

A fast high-speed line that runs directly between the capitals of Sweden and Finland. Passing Åland on the way. The high-speed railway runs both in a tunnel under the bottom bay but also on bridges. We have sketched a possible layout and you will find that sketch below.

This means that if you leave Stockholm at 08:00, you will be in Helsinki at 9:38 with the fastest connection. Also means that the train has time to make many trips, round trips, during the day. Also stops at both Norrtälje and Arlanda.

There are also proposals for a fast line between STOCKHOLM - HELSINKI that goes around the entire bottom bay and you can find it here