According to Rail planner reservation for this train is required. According to DB it isn't. According to what I know reservations are not mandatory for any regional trains. So what is true and what is false?
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From Goteborg to Oslo. Reservation required or not?
Best answer by rvdborgt
You could check with TΓ₯gkompaniet, which is the operator. If they say you have to book, the next question to them is where to book, since their website doesn't offer that possibility and neither do sj.se and interrail.eu for this route.
TΓ₯gkompaniet (nowadays Vy) have a Swedish website, Norwegian website, email and Facebook.
If you book a normal ticket on the Norwegian website, then you have the choice between "free seatingβ and "seat reservationβ (for an additional fee), so it looks like a reservation is not obligatory.
+15Back in 2019 a in needed a reservation please note that trains can be reservation compulsory even if not marked like that at bahn.de/DB Navigator.As the train operated within Norway as Intercity :)
There still exist even few regionaltrains that a reservation compulsory in Europe it always depends on the train company if you need a reservation or not 
My suggestion Contact SJ (Swedish Rail) via Facebook or Twitter (they respond pretty fast) to get a final verified answer :)
IΒ΄ am not working for Eurail or Interrail i just share my knowledge here. Please ask in the Community and not via private message as this is the fastest way to get an answer. I prefer English/German/ Czech for my answers. In case of Reservationquestions please share some details like Route, Date, Trainnumber as otherwise we can just provide general advices or answers
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You could check with TΓ₯gkompaniet, which is the operator. If they say you have to book, the next question to them is where to book, since their website doesn't offer that possibility and neither do sj.se and interrail.eu for this route.
TΓ₯gkompaniet (nowadays Vy) have a Swedish website, Norwegian website, email and Facebook.
If you book a normal ticket on the Norwegian website, then you have the choice between "free seatingβ and "seat reservationβ (for an additional fee), so it looks like a reservation is not obligatory.
Please ask questions in the community and not via a private message. That's the quickest way to get a response. I don't work for Eurail/Interrail.
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Thanks a lot for your answers!
I asked Vy via Messenger and as soon as I receive an answer, I ll let the Community know about that
Hello again, just received an answer from Vy .
It is short but clear :
Hi, there's no mandatary seat reservation. But you may end up with no seat at all if the train is full.
Nesh
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Hi, thanks for checking in. We are looking into the case as we speak. The problem is that the train Oslo-Goteborg has the same trains type in and provider as Oslo-Bergen. Therefore, it is not easy to make a distinction between them. To apply it manually, we need to know the specific train numbers. We are currently looking into solutions to change the information. I'll keep you posted here.
Addition 13/01/22: We managed to find a solution so the Oslo- Goteborg route is now shown as reservation optional.
Please note that I can't reply to any of my private messages at the moment. Thanks for your understanding.
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First is my question, then I upload the same screenshots I posted here and final - their answer :
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