The Wall Street Journal just posted online a very interesting feature article on the topic this morning. I would expect it will be in the print edition tomorrow.
It focuses on efforts of Norfolk Southern at it's yard in Decatur, Illinois to implement the PSR concept. Its a mixed media piece with some great video, photography and automated schematics accompanying the article.
Unfortunately it is behind WSJ's pay-wall. Here is the link, if you don't subscription at least you will be to see a great drone aerial video shot of the yard.