There was a second caboose mounted on hiway wheels for training. I took a class in it in the early 1990s in North Dakota. There were a couple control stands. I remember a Lionel train connected to them running around the cupola. There were a couple sets of AB equipment down the middle of the car with gauges connected to all the various reservoirs so you could observe the various pressures. The air brake arrangement did have some educational value, but the control stands didn't prove to be much.

THere was one comment about air that has stuck with me all these years - The one time the engineer has no control over the train is when it is an emergency application has occured. That is very true, except for bailing off the engine brakes or maybe havinga pcs delay or keeping dynamics, you are pretty much stuck riding it out regardless of hitting anything or watching cars roll over.