Yes, you can generally bring wine and other alcoholic beverages on Eurail and most European national trains for personal consumption. Unlike airlines, there is no "liquids limit" for train travel. However, specific operators like Eurostar (connecting the UK to Europe) have stricter policies; as of 2026, each passenger is typically limited to one 750ml bottle of wine or four small cans of beer. On standard high-speed trains like the French TGV or German ICE, you are free to bring a bottle of wine to enjoy with a picnic at your seat. The "pro-tip" for 2026 is to remain considerate: loud or disruptive behavior due to alcohol can lead to being removed from the train at the next station, and some "night trains" or specialized "party" routes may have temporary bans on bringing your own booze.