https://back-on-track.eu/about-back-on-track-2/

We are campaigning for more, better, affordable, long-distance and cross-border #nighttrains in Europe. Why? Because we are convinced that night trains could not only be a modern, comfortable and relaxed way to travel but also an important solution to reduce the EU’s contributions to global warming by up to #3percentOverNight, particularly by substituting short- and medium-haul flights. See more about who we are and what we want (mission statement).

goood
https://back-on-track.eu/resources-for-booking-cross-border-rail-tickets-in-europe/