I am adding another set to the layout it is the Pennsylvania K4 4-6-2
this particular engine ran through our farmland when I was 7/8 long time ago. I'm going to have it pull the older Penn passenger cars.
I've got a T-1 high-stepper, a Hudson, and a NKP Berkshire that run together on a stretch of 4-track on my layout. The Berkshire is for fast freight while the other two head passenger trains. Looks impressive when the three are running together or one right after the other. And I let 'm fly on the stretch. That was the way it was back in the day. High speed service.