It’s unclear looking at Google imagery if the quarry at Rock Springs is still used to mine ballast and load it into hoppers on the line that comes up from Madison. Does UP still get ballast from this quarry or has it been more or less played out?
The siding along the mine appears to be used for storing freight cars now.
On another note, when does UP usually operate over the line up to Baraboo and Reedsburg?
This is a WSOR line since 2014, I believe, purchased by the State from UP. Recent images show a WSOR local working to and from Reedsburg, but there are no signs of ballast cars during the past year or few that I have been able to find. Of course that local is nicknamed the “Reedsburg Rocket”!