I went with a young niece and her dad and we had a great time. There is a very large room with a center table covered in multiple scenes with several train lines weaving in and out. You walk slowly around the circuit looking at small towns, trains, etc. The more OCD visitors can get "treasure-hunt lists" of various things to search for and check-off the list. The display is amusing for adults and kids in the 3-10 range really seemed to like it. The room is large enough for small kids to run around like maniacs when the urge strikes without negatively impacting other visitors. They have lots of small booster steps so shorter kids can see onto the table.
Takes about an hour to see it all.
They also have small rooms with other exhibits and for birthday parties.
Fun time for all of us - nice staff too.