A couple of small "mom and pop" / repair stores just came to mind:
- Log Cabin Trains - a one-man repair shop off Camp Horne Road north of Pittsburgh. This was a very hard-to-find location. Unfortunately, a thief found it and robbed the place (mid-late 1990's?). It closed as a result.
- Blue Mountain Trains (or Hobbies?) - I believe this "store" (really his basement) was north of Annville, PA. The owner passed away in the early 2000s.
George