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@quarague You guessed wrong. Why not download the data for yourself to check? It appears there are a few hundred lifts where this bike would fit diagnonally (assuming a length of 2.45 m). The largest can be found in Hamburg Airport, and are over 5×2 m!
Openstreetmap has an optional bicycle tag for highway=elevator, but of course that doesn't tell anything about its size. It would be a nice enhancement though.
@Luc No, I meant they can sell international tickets that include a domestic section. In my question, I mentioned the entire journey is from Utrecht to Paris, so SNCF can sell that (never mind you can't get the ticket). DB can sell a ticket to Berlin that for instance includes a local journey from Utrecht to Amersfoort, and they do.
That's unfortunate, but not entirely surprising either. I think that technically they could do it, I mean, Deutsche Bahn can, so why not SNCF. Wether they want to is a different question of course ;-) I'm still waiting for a reply from SNCF, but they're slow to respond.
@ROIMaison That page is about being able to pass the gates at a station. I assume that the Eurostar ticket (Rotterdam to Paris) will only allow that in Rotterdam. And I don't think the Eurostar ticket is valid on domestic trains (but I'll need to check that to be certain)