I guess I'd want to go back a bit and focus on some vanished 19th Century treasures.
DSP&P - any one of the Mason 2-6-6's
As luck would have it - one of these was saved and stood outside for many years - it was donated to one of the WWII scrap drives.
A good example of a pre-Civil War build 4-4-0 - The Amenia would suffice
A PRR D6 in original short boiler and high wheeler configuration
and for the early 20th Century - an Ma&Pa 2-8-0
It is my understanding that in the case of the Ma&Pa 2-8-0 the real one was offered to museums but there were no takers.