That's nice work JPV.
In 1998 I had an 8900 mile Amtrak trip around the USA, mostly on Superliner trains. Traveled coach all the way on an economy ticket. I usually had an empty seat next to me at night and it gave more space to try to sleep. The big cars ride well. The coach seats are spacious and comfortable. Unfortunately some of the coach seats don't line up well with the windows, if you want a view.
I spent a lot of time in the lounge-observation cars too. A superliner coach has five rest rooms on the lower level and I never had a wait to use one. Top speed for those trains seems to be 79mph, limited by track and signalling standards.
A string of scale Superliner cars would need a rather large layout to run on!
My photo at Dry Canyon trestle near Hotlum siding on the north slope of Mt Shasta in 2003.