I have a solution from yesteryear for you. Behold, the slip coach. https://www.youtube.com/watch?v=Bq0aA9RZ1ls https://www.youtube.com/watch?v=Bq0aA9RZ1ls The

I have a solution from yesteryear for you. Behold, the slip coach. https://www.youtube.com/watch?v=Bq0aA9RZ1ls https://www.youtube.com/watch?v=Bq0aA9RZ1ls The train passes through France non stop. Along the way, around 2AM, a single carriage decouples from the end and smoothly glides into a Paris terminal, where it functions as a de facto hotel room for the night as guests won't be kicked out until morning. Will anyone use it? IDK. But it does satisfy the requirement of stopping in France.