Not Lionel engines but I've got the following, also at the B&O Museum:
MTH Railking SW1, Chessie/C&O #8401 with Pere Marquette #11, SW1. The real PM 11, after mergers, became Chessie/C&O #8401 before being restored to it's Pere Marquette 11 livery at the B&O Museum. Our very own B&O Bill even used to be the engineer!
MTH Railking C&O #490 Hudson "Yellowbelly" with the real thing, also at the B&O Museum!
I also had the same MTH B&O Passenger GP9 that is at the B&O museum. I sold that engine (and have regretted it since) before I did a photo with the real one at the B&O Museum.