Initially the train would mainly serve people without cars, and those for whom driving to a single destination might be too-expensive or too-stressful.  Such a train would work well for Broncos, Rockies, Avs and Nuggets games as long as its cost was subsidized by a similar percentage as RTD's light rail is now.  It could also serve Air Force and CSU football games. 

I don't see the more-expensive train at this point but perhaps our rail commission should look into standard off the shelf mid-speed rail equipment already in use in the US such as the Acela or Metroliner trains in-use on the East Coast.  The Metroliner trains are capable of 110-120 mph on good straight track and the newer Acela trains do about 155 mph.  

Such a system might put on a baggage car or two and also haul small packages to and from Denver or the other stops to help with the cost.  I could see maybe 4-6 trains daily from Ft Collins to Pueblo, which should take maybe 2 to 2.5 hours including 7-10 stops.