I do not have a specific prototype display, although I do have an engine as a "static display" near a station, somewhat similar to the Gaithersburg, MD B&O station which displays a B&O RDC, C&O Bay Window caboose, and 1918 BC&G 2-8-0.
It can be seen below, right near the light post. This is a very, very old photo and much has changed since I took this. This is the only photo I can easily find.
I have several models of REAL engines currently on display. Below are two I've photographed:
MTH Railking Scale SW1, Chessie/C&O 8401. It is resting on the front of the Pere Marquette #11 an SW1 on display (and operable) at the B&O Museum in Baltimore. #11 started life as PM #11 and became Chessie/C&O 8401 later in life. It was restored to the PM #11 appearance by the museum.
MTH Railking C&O #490 Hudson, on the real #490 at the B&O Museum
I also have an Williams Toronto Trolley and several TTC PCC cars within a 30 minute drive, among a few others that I haven't done comparison photos.