You're right. Some of the parts on Eureka have been replaced or rebuilt. However, for the sake of accuracy, I should correct a couple things. First, the rods are all original to the locomotive. The cab is "new" but then the hardware in it is the original stuff that I could salvage and repair. I still have the original cab, and except for a few large members, much of it was replaced by the railroad .....not with the original wood walnut, but Doug fir. So, one might ask the question...is the new cab more "original" than the one it replaced?
The "new" parts are the pilot, headlamp, and smokestack casing.
The center stack is the original. The running boards, tender sills, fenders, jacket and a few cab appliances are new. However, the original parts, and by that I mean built in 1875 and put on at the factory, are the boiler, all domes and brass (except cylinder cover brass which was destroyed by some nut who slung a chain under the cylinders), the entire running gear and linkage, tender tank, truck frames, driving wheels, whistle, bell, and builders plates. There are a few things I have not put down as a concession to the shortness of life, but that's about it. I would say that all of those things that have been rebuilt or replaced are what I refer to as "consumables". The railroad routinely replaced many of these things as needed. So, as far as I can see these are not just restored pieces, they are pieces that would have been replaced in any event, for the most part, and in many cases ordered as new parts from Baldwin. Consider me sort of a latter day parts subcontractor for Baldwin.
Anyway, thought you might like to know.
Dan