We are now collecting signatures for night trains from northern Europe to Germany and further south. The petition, targeting the swedish and danish government, will run until May 31st 2018. Here is the english version:
The swedish version can be reached through https://www.change.org/p/satsa-p%C3%A5-natt%C3%A5g-i-norra-europa
and the danish can be found at https://www.change.org/p/nattog-i-nordeuropa.
Here you can download a folder in swedish, “selling” the proposed time tables. It is fully possible with existing stock to have one night train starting from Stockholm at 18:40, passing Malmö/Copenhagen around midnight, arriving in Berlin at 8:30 and in Köln 10:30. Alternatively to take a day train from Oslo or Stockholm to Malmö / Copenhagen, taking the night train at 17:30 arriving in Paris at 9:58 the next morning.