This is a permanent argument in most other fields of modelmaking. In model cars it's usually crash damage, on model aircraft it's the bulging of wing fabric and the "oil canning" of metal skinned aircraft. And don't even begin with the rippling of large ships, especially battleships. Arguments abound as to the bulging of canvas, but most other effects are there to see for everyone. As I've been researching racing cars for dozens of models of them I see GRP mouldings of the most appalling asymmetry, but do that on the model and I'd be laughed out of town. Out of interest, the worst culprit I've seen was Lotus in Jim Clark's day.
I think you could do it in the railway world as weathering is now so completely acceptable, so a little iffy panelwork would be lauded, I'm sure.
That 2 tone green could almost make me like diesels!.....almost.