Hey Ethan,
Like John said, the open air car is a must experience. The last trip I did our very own Rich Muth was the docent in that car...I sure enjoyed getting to meet him but also getting to hear of other things on the line. It was great.
Make sure and take advantage of the platforms between the cars. When I need a break from the crowds in the open air car...I head there.
On your ride day as well...we have always loved heading to the yard early, to watch the crews reading for the days trains and walking the yards in the early morning light.
Craig
Somewhere up in NoCo