I tend to agree with john gunnerman, 60% or less, but then it depends might be a older steam engine which was made better then the new engines but has the old ps1 or protosound electronics, the thing is sometimes times they are listed as new old stock and unopened, i do believe i would rather have an older engine this is built better then the new one but since i can repair my own locomotives i pay a little more for an engine because the cost of the repair will be only the parts same as John or George might due since we all repair our own engines, look at the last Engine John just finished rebuilding and it pulls better consist then it did when it was new, and he had spare parts from old engines to repair it with. You have to remember this is a hobby and we all enjoy our hobbies especially when we just trouble shoot one of our locomotives and the rewards are watching it run and hearing all the great sound come out when the repairs are finished.
The Joy of our hobby's so let all enjoy our trains!
Alan
Choo choo choo