I learned the hard way when I first booked Lufthansa with a Rail & Fly ticket. I thought it would be automatic, but turns out you need to select it during booking or add it later. I messed up and only realized after confirming my flight. The easiest fix was just calling 877-764-3622 — the agent added the Express Bus option to my ticket in minutes. No stress about online forms or waiting on emails. They also explained how I could cancel or change it if my train times didn’t line up. Honestly, I’d just call that number right away if you’re unsure, because it saves a lot of hassle.
