What do you mean? A Eurail is valid on most but not all trains in the participating countries. Some trains require advance reservations and supplements as well. Read the information on this site and get back to us if anything is not clear. As always give details about dates routes and times

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HoHO are usually (doubledeck) BUSes-or in rare cases some other very touristy form of transport-that has stops at all main touristy sites in major cities. These mostly offer fairly expensive ride-at-will day passes (and often with man ways of discount-ask in HTL). NONE of these are ever covered by EUrail. In most cases a normal day ticket for all transit in that city will be much cheaper-but makes you need to plan and search all trips to be made-often quite a challenge for those from over the oceans without any experience in using normal transit.

At least some 70-80% of all these HoHo are now -in the far background- run by STROMMA tourist-travel company.