Originally Posted by
Unterwegs
You can even buy the ticket at the arrival station.
To save time i recommend: walk to the train station until you see the overhead sign when the next train will be leaving. If you have only 2 or 3 min left just board the train and buy the ticket at the arrival station. Same if there is a long line at the ticket booth at the departure station (they take credit cards).
This is good advice regarding something that is not particularly apparent, particularly to first-time visitors. It's also one of the many great features about the Airport Express in general.