This lets me link to Seat61, who have an excellent guide on taking NightJet trains (and all other European rail travel): https://www.seat61.com/trains-and-route

This lets me link to Seat61, who have an excellent guide on taking NightJet trains (and all other European rail travel): https://www.seat61.com/trains-and-routes/nightjet.htm https://www.seat61.com/trains-and-routes/nightjet.htm