There's a deadline at least a mile long behind the roundhouse on the New Hope & Ivyland. It's full of old rail cars, box cars, at one time a couple of old ex-Army 0-6-0 switchers (I think those were finally sold off or scrapped about 10 years ago)... all "stored", all left to rot.
Some are (technically) owned by individuals or private groups. Technicalities aside, most appear abandoned.
You'll find stashes of old stuff all over the place, if you look. There was also a lot of stuff stashed on the Black River & Western, at the Ringoes yard. It was very sad to see the current state of the PRR 4666 Doodlebug; it will take a massive overhaul to ever get the poor thing running again.
Now, the good news is that some of the interurban cars are saved and on display at museums. The Trolley Museum down in Washington County, adjacent to the County Fairgrounds, not only has a large display, but a working track that they actually run a lot of the cars on. Really fun to watch!