I think the number of trips says a lot about the role trains play in people’s everyday lives, maybe even more than the kilometers travelled. Sure, that’s not a “metric”, but it does give us an idea if people use trains just for vacation a few times a year, or for their commute to work or other daily trips. For someone taking a train just once a year, even if that is for hundeds of kilometers, we know that they will use a different means of transportation for most trips.
Ich hab zum Beispiel im Zug manchmal das Problem, dass mein Tablet sich nicht mit dem DB WLAN verbinden will (warum auch immer). Da ist Hotspot oft die einfachste Lösung.