You do the best you can with what you have. I'm trying to do realistic scenery on my new layout(and I think you can kitbash and weather Plasticville). I'm trying to have prototypical consists and correct regional and era consists running together. Don't run the N&W 746 J with the Amtrak Genesis nor have the Santa Fe 2353 pulling articulated CSX auto loader cars. As for things like swinging pilots, remember our sharp curves: we need stuff like that. OGR ran an article several years ago about if we had our curves actually to scale on what the 12" to the foot trains did, our urban trolleys would be O88, our branch lines might be O180, and our main lines might be something like O360. So we have to have something that would fit in a house smaller than Jerryworld in Arlington, Texas.