Many night trains are equipped with Wi-Fi. However, the quality and reliability of the Wi-Fi and mobile phone reception varies. For example, the connection may be weaker or interrupted in rural areas or tunnels. Capacity is also limited, especially on a packed train.
To be safe, prepare yourself so you don't have to go online while travelling. Save your ticket on your smartphone at home and print it out if you want to be on the safe side. Download entertainment media such as films and music before you travel.
The vagonWEB website has detailed information and pictures: Enter the train number in the appropriate search box and select the train in question.
For example, the train number is NJ 402, which you can find in the search results on nightride.com or on your ticket.
Please note: The actual carriages used may differ from those listed on the website.