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Superfastから返答がありましたのでご報告しておきますね♪

Thank you for selecting Superfast Ferries for your travel needs. Please note that we do not make pre bookings for train passes. You need to exchange your voucher at the port the day of departure.

Below please also find useful information for Eurail pass holders:

At the port, you are required to pay only port dues, which are 6 Euros per person per way as well as 10 euro for the fuel
surchanges.・・・・・・

以下は以前ちゃぼさんが貼り付けてくれてたものと同様です。