I'm not certain about this location. I can't seem to find all the roads they talk about in the article. Plus, the Lancaster Pike they are talking about is probably what is called Old Lancaster Ave now. But that seems to terminate in Paoli. I'm wondering if what is Paoli Pike now used to be Lancaster. Perhaps some of our Philly veterans here can help out.
EDIT: my friend Jim Hutchins sees there is a Green Tree via Google, and this is probably a better location. This site would be real close to the current Waynesborough, and very close to the NLE Tredyffrin CC.