@SundayShunter posted:Big steam locos might need wider curves, but even 6-axle diesels & longer modern freight cars can take 36" radius curves. Of course they can look a bit silly doing so, just like HO models on 18" radius, but "can't be done" is just a myth. Here's a YouTube link showing my Atlas SD40 on the 36" curves at one end of my layout. First car in the train is an MTH Centerbeam on Atlas roller-bearing trucks.
You're right. Those MTH centerbeam cars are very nice if you correct the truck placement. I think I have about a half dozen I'm doing the same thing to. I think Atlas now has the tooling; what are they going to do with it?
How about contemporary covered loads for them?