There currently are a variety of options to travel by night train from Vienna (Austria) to Dąbrowa Górnicza (Poland), taking between approximately 6 and 8 hours: Namely the IC 40406, the IC 406, the EN 406 and the EN 40406. These lines are operated by PKP Intercity, ÖBB and České dráhy.
PKP Intercity is Poland's national long-distance railway operator, running domestic and international train services throughout Poland and to neighboring countries.
The Austrian Federal Railways (ÖBB) operate the Nightjet and Euronight trains (the latter together with other national railway agencies).
ÖBB night trains typically feature four types of carriages: seats, couchettes, the compact Mini Cabin, and sleepers.
Seats are for the bravest, while couchettes, Mini Cabins, and sleepers provide a more comfortable journey. In the couchettes, you can find simple and rather narrow berths. The Mini Cabin is a compact sleeping option for solo travelers – two Mini Cabins can be combined for couples. Sleepers are equipped with proper beds and sometimes even a private bathroom. Couchettes accommodate up to six people, Mini Cabins are designed for one person each but two can be combined for couples, while sleepers are private compartments for one to three people.
Sleepers may include a private bathroom or shower, or sometimes just a sink. The Mini Cabin bridges the gap between couchettes and sleepers, offering solo privacy at a lower price point.
České dráhy (ČD) is the Czech national railway operator, running domestic and international passenger trains connecting the Czech Republic with neighboring countries.