
Vancouver, Washington Amtrak Station has more ridership than 19 states
This might seem like a random "fun fact", and might be especially odd for people who don't even remember that there is a Vancouver in the United States!
But Vancouver, Washington, a suburb of Portland, Oregon, has more Amtrak ridership than 19 states, and also has more riders than any single station in five more states. Houston, Dallas, Austin, San Antonio, Atlanta, Cleveland, and Cincinnati are all cities that have less riders than the Vancouver, Washington station, which isn't in a big city, isn't in a tourist city, and is just a little building in the middle of a freight yard.
But Vancouver does have regular corridor service: there are currently 12 total trips on the Amtrak Cascades, plus the Coast Starlight and the Empire Builder, so people have a variety of options for taking a trip. This is what seems to drive ridership, is when people have multiple options of when to take a trip per day.
(I chose Vancouver to make a point, but even the lesser used stations on the Amtrak Cascades, or any other corridor route, is going to be more active than even most big cities that only have long distance trains, especially when they stop once a day at inconvenient times).
Data from here:
https://www.amtrak.com/state-fact-sheets