Agnes, with the exception of healthcare, I'm not very knowledgeable in this area of infrastructure.  Hospitals in the US are owned/financed in one of three ways, that I know of: private for profit hospitals (ex. HCA, Hospital Corporation of America), private but non-for profit hospitals, (ex. Northwestern Memorial Hospital, University of Chicago Hospital, the Sisters of Whomever--financed through their revenues, charitable donations and municipal bonds), and government owned hospitals (ex. Cook County Hosptial, financed by their revenues and various taxes).  I haven't seen the %'s in a long time, but for profits are very small, I think like 10--15%.

But my impression is that almost all of the other areas you are talking about are owned and run by some level of government.
o  Roads--it made the news a few years ago when the Indiana Turnpike between Chicago and Indiana was privatized,,,,news because I think it was so unusual.
o  Airports--O'Hare is owned by the City of Chicago.  Isn't government ownership true of the vast majority.  Airlines are of course for profit companies, normally traded stocks on the stock markets.
o  Railroads--the track is government owned, the trains are mainly for profit private, though some are government owned.

Obviously I don't invest in this area.  But am I wrong here?  It almost seems Europe is going private  in some of the areas and the US is not--but that would be hard to believe.