In the Netherlands you can profit from reduced boat travels and a museum discount.
The benefits mentioned here are available to:
Stena Line
Reservation is compulsory. More information: www.stenaline.com.
DFDS Seaways
25% discount on all categories except 'Commodore Class'
More information: www.dfdsseaways.com/railpass.
Not available at the moment.
Usually extra Pass benefits can be obtained locally by showing your Eurail Pass. Sometimes you can make reservations in advance through a call centre or website of the company concerned.
Travel days
If a benefit gives you free transportation, it requires the use of a travel day if you have a Eurail Pass with flexible validity. In case of an overnight ferry, you may enter the day of departure or the day of arrival in your travel calendar. If a a benefit only consists of a discount, it is not necessary to use a travel day.
Ferry crossings
For free passage on international ferry routes, your Pass must be valid for the country of departure AND the country of arrival. In case of discounted passage, your Pass must be valid for the country of departure OR the country of departure.
