The European Commission announced it will support 10 pilot projects to establish new rail services or improve existing ones. Together, they will improve cross-border rail connections across the EU, making them faster, more frequent and more affordable. Here follows the project related to Scandinavia that involves Copenhagen, Gothenburg, Malmö, Stockholm and potentially Oslo:

Connection Germany – DenmarkSweden, with participation of SJ (new night train service Stockholm – Copenhagen – Berlin and day train Hamburg – Gothenburg (and potentially Oslo, in co-operation with DSB and DB), Snälltaget (enhanced night train service Stockholm – Copenhagen – Berlin), České dráhy (new service Prague – Berlin – Copenhagen, in co-operation with DB and DSB) and Flixtrain (new service Leipzig – Berlin – Copenhagen– Stockholm)

Read more on Transport.ec.Europa.eu