There's a Birney car that is part of a restaurant in Skippack, PA.
On the old diner front we ate at the Cloister Restaurant in Ephrata PA whose modern exterior hides a classic stainless diner from somewhere in the 30's to the 50's. They were closing so I couldn't see if there was any manufacturing information or "tag" as the diner site on the web calls them.
It even has opening windows reminiscent of a passenger car or school bus window.
Here's a post card shot from thebay:
