That AC-12 looks fantastic. I see one with sound and DCC sells for around $350! https://tonystrains.com/produc...ndard-dc-ac-12-4294/
The detail is great, and I know Intermountain engines are great running!
I agree completely with NH Joe! For a long time into this century I equated O gauge with MPC trains of the '70s. An older coworker showed me an MTH catalog back about 15 years ago, and it was then I realized O gauge had come a long way. (Come to think of it, now I don't have any older coworkers)
Well, sounds like you are a little less than 25 years younger, but you shouldn't have vision problems like mine for sometime, maybe never!! I also agree with NH Joe, my arthritis makes it harder to work on smaller things. My dad is 87, and he still has better dexterity than I do. He has just started having trouble with arthritis, and has been asking me for advice. Everyone is different!
I have enjoyed the discussion! All scales have pros and cons for each person. But one thing is, no matter what scale you talk about, the models being produced now are outstanding when compared to 40 years ago.