Nearly all the news media have framed Denver as a place you can't get into or out of. With a few exceptions like this Indianapolis station.
But lookit, Amtrak's running out of Denver.
Now is the California Zephyr running late? Of course. Is it crowded? Likely. Might it run out of food en route? Sure; provisioning is more art than science anyway, and abnormal circumstances throw everything out the window. But it's warm and it's moving.
Passenger trains add a measure of redundancy to our transportation network that comes in handy when the weather's bad. And despite attempt after attempt to strangle and dismember it, Amtrak still maintains a nationwide network. Now to be sure, it's tissue-thin in places like Denver (one train a day, each way) and nonexistent in places like Columbus (Ohio or Georgia) but a network nonetheless. That Indy station's article notes that a Hoosier can ride Amtrak to Chicago and connect there to the westbound California Zephyr, subject to availability.
And the Amtrak network looks a little more robust when you zoom out a little to pick up airports.
From Denver you can ride east to Omaha: a city well east of the snow and served by all the major carriers at its airport Eppley Field. Westbound there's Salt Lake City, which according to FAA's flight delay map seems to be operating normally.
If the object is to get people to their destinations, trains have a role to play. A new Congress offers an opportunity to expand that role.