Each Christmas Holiday Season the College Park (MD) Aviation Museum has a "Trains and Planes" display, featuring the National Capital Trackers Modular O-Gauge Layout. This year the display started last Saturday and runs through Saturday, December 21. Hours are 10 AM-5PM. Admission is a very reasonable $4.00 for adults. The museum is really a "hidden treasure" of aviation history.
Here's some photos from yesterday's visit.