I will be taking this bus that is covered by my Eurail pass next week. Since there are no reservations, can I just show my Pass and be allowed to board the bus? Will it fill up before I can board since I don’t have a reservation? thanks

I will be taking this bus that is covered by my Eurail pass next week. Since there are no reservations, can I just show my Pass and be allowed to board the bus? Will it fill up before I can board since I don’t have a reservation? thanks
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