That is impressive to see, with all new cars and engines. Interesting on the mid engines. That seems to be an awful lot of engines for the train.
I'm curious though, what is so significant about needing to test a 100 car configuration. When i was a child in the mid '60's, my friend and I would ride our bikes to the train depot, and sit on posts and watch the trains go by. We would count the cars. My recollection is that trains with close to or over 100 cars, was the norm. they weren't all coal cars as shown here. They would be mixed loads of iced cars, box cars, flat beds carrying tanks and trucks (the Vietnam War was in full swing), tankers, gondolas.
So i'm just curious what the significance is. With 6 engines, that SSR train has to have plenty of power compared to the old diesel electrics that were running the tracks when I was a kid.