NKP 587
My favorite is the NKP 587, owned by the Indiana Transportation Museum in Noblesville, IN. You can learn more about it here:
http://www.itm.org/equipment/nkp_587.htm
It's my favorite because I used to live in Broad Ripple, and it sat in Broad Ripple Park for many years. Vandals had broken out the glass on the gages, grafittied it, and more. Then, cerca 1987 the picked it up, put it on the Monon (now a linear park) and sent it off to be refurbished. It ran for something like 15 years until it was due for another refurbishing.
Another favorite is what's known informally as the "Flagler Car"
http://www.itm.org/equipment/flagler.htm
One day when we were visiting the museum, a docent slipped out from behind a car and said, "Psst! Wanna see something really neat?" He took us to the back of the grounds, unlocked a pole barn, and led us into the darkness. From the outside, it looked like just another old car. But when we got inside, it was the most opulent train car I had ever seen!
The windows don't have sash weights. They are so finely built that when you raise one and let go, it just goes "Psssssshhhh!" and slides slowly down. The whole thing is wooden on the inside, and they wipe it down in lemon oil every month.
In the state room there is a closet in the corner. The closet door clears the bedpost by 1/16 inch! When you try to slam the door, it goes "Psssssh!" and latches gently shut.
In the dining room is a buffet with intricate carving on it. There's a niche on the buffet with a mirror. They even carved the trim that faces the mirror so that it's reflection would be pretty. Nobody sees that face directly.
The dining room also has a fireplace with a marble inlay. It's the same inlay as you'll find in the Flagler Mansion in Jacksonville, FL.
I believe the car cost $3.5M when it was built back at the turn of the 20th Century.
-- Russ