I  am guessing that the solid lines with the directional markings are microwave paths  I wonder if the dashed lines are following railroad right of ways?  I know that fiber optic cables run along the RR right of way now.  I am not sure if they used to do the same thing with copper.  Now that I think about it, there always used to be overhead cables or wires along the RR right of way.  I had always assumed those were for RR communications.  Perhaps I was wrong and they belonged to someone else who leased the space.