Anything that runs on O36 such as LionChief, RailKing, etc., was probably produced in large numbers. So it shouldn't be hard to find a parts donor ten years from now. If you do feel compelled to buy a backup for spare parts, make sure you get one from EXACTLY the same production run. For example: I remember some frustration with the LionChief Plus Mikados because apparently Lionel used a different builder, or changed the driving rod screws after the first batch. Welcome to the joys of modern O gauge!!
Personally I would leave my money in the bank. Examples that can be cannibalized for parts will always be out there. And trains with improved sound and features appear in each new catalog. If my 6-12345 stops working one day, I won't really care, by then I'll have moved on to something else. My $.02.
