If your Eurail pass is valid in Poland, you can get discounts on ferry crossings between Germany and Finland.
You can obtain benefits locally by showing your Eurail pass, or you can contact the specific benefit company in advance. The discount benefits only apply during the validity of your pass. Free passage on trains, busses or ferries is only valid on travel days.
Holders of a 1st class Eurail pass have free access to the PKP lounge (Strefa VIP) at Warschau Main station (Warszawa Centralna).