Solar Noon

I have an uncommon interest in timezones and solar patterns.  A while ago I wondered where in the MST does the timezone time and the solar time match.  

One way to find out is to find the location where is it solar noon on an equinox day.  A friend of mine used solar-noon.com to figure out that Albuquerque is where solar noon and MST noon are the same (see chart).  Kind of funny that is always daylight savings on the equinox days.

I just noticed that the spring equinox is not noon.  I am not sure what that means.