First, I made sure that all my accessories and operating cars worked. They did.
Next, I ran the biggest engines I had to check clearances. I had to make only one trim.
Finally, I brought out my original set from 1952 with the 2025 K4 and ran it on my freight line, and ran my 9-car aluminum 2500 type cars behind my MPC NH F3's.
And then I sat there and grinned like a fool for over an hour.