The Savio Rail Tunnel near to the capital city of Helsinki

Helsinki

Helsinki is the capital and largest city in Finland. It is in the region of Uusimaa, located in southern Finland, on the shore of the Gulf of Finland, an arm of the Baltic Sea. The population of the city of Helsinki is , making it by far the most populous municipality in Finland. Helsinki is...

, Finland connects the Vuosaari Harbour

Vuosaari Harbour

Vuosaari Harbour is a seaport facility in Helsinki, Finland, opened in November 2008....

 with the Helsinki–Tampere main line in Kerava

Kerava

Kerava is a town and municipality in Finland.It is located in the province of Southern Finland and is part of the Uusimaa region. The town has a population of and covers an area of of which is water. The population density is...

. The tunnel is single track, electrified and 13.5 kilometres long. Construction begun in 2004, and the tunnel opened in November 2008. The tunnel is part of a new 19-kilometre line linking a new port.