Thought about this, too. At Brussels, reckon DB passengers boarding a London bound ICE, will use the existing Eurostar check points, then the Thalys-Eurostar shortcuts passageways to join the train on the through Thalys platforms.How will this work at Brussels-Midi? The E* platforms (and associated passport controls, holding areas etc) are dead-end, and somewhat separate from the main station. Will passengers be able to leave/join the train at Brussels in both directions? Or could this in fact be a non-station-stop, just a stop for splitting the units?