What's happening with Brussels to Frankfurt services on 14-16 August? ÖBB's website, int.bahn.de and the DB app all show the 14:25 14/08 departure as running, but they don't let me buy seat reservations ("reservation cannot be made" / "keine Angebot möglich"). The Interrail journey planner only shows the service as running to Liège-Guillemins, with changes there and at Aachen needed.
Seat61 says seat reservations are mandatory for intercity Brussels to Germany services for 1 June to 1 September; I'd guess that they're only mandatory for the cross-border part, with Brussels to Liège showing on the Interrail app because it avoids that? I don't know if the service would be fully reserved three months in advance or not though.
Edit: "request unsuccessful" for b-europe.com, having shown reservations for €6 per person for direct Brussels to Frankfurt Airport trains.
Seat61 says seat reservations are mandatory for intercity Brussels to Germany services for 1 June to 1 September; I'd guess that they're only mandatory for the cross-border part, with Brussels to Liège showing on the Interrail app because it avoids that? I don't know if the service would be fully reserved three months in advance or not though.
Edit: "request unsuccessful" for b-europe.com, having shown reservations for €6 per person for direct Brussels to Frankfurt Airport trains.
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