Specifically, Eiropas Dzelzceļa līnijas said that the companies will compete to design and build the Rail Baltica Riga Railway Bridge, railway embankment and the Riga Central Passenger Station.
The complex project will see massive parts of Rīga's historic center refitted for the new railway and a new bridge built across the River Daugava, equipped with a cycling track.
The six contestants include experienced international partnerships.
Rail Baltica is a 6 billion euro railway transport project, which aims to integrate the Baltic States within the European railway network. It is envisaged to build a new 870 km long European gauge (1435 mm) railway line with a maximum speed of 240 km/h.
