The Humane Society has some suggestions for how to protect feral cat colonies from coyotes. Not sure if you’ve already tried all of these or if they would even work for your location, but it seems worth considering.
This sounds absolutely fantastic. If I could have ridden a train from Boulder to C. Springs in college, I would have never needed a car. With the number of commuters that live outside of Denver and commute to it (or more rarely in the other direction) having this option should greatly relieve the number of vehicles on I25
Stay safe! I hope they find the guy soon.