As I get a bit older (I'm now 77) and when I buy a particular engine that I really like, I do concern myself a bit with what my family might do with my trains once I'm gone. I no longer buy everything that strikes my fancy but, rather, make a few selective purchases of things I really like. Right now I anticipate only purchasing 2 or 3 new engines if they ever become available. Also I can no longer afford to buy as many trains as I once thought that I must have.
As to future value, my instinct suggests that the future value of contemporary trains is something less than 1/2 of what I paid for them. The loss must be charged to my pleasure in owning and operating these items. In the future, my family knows that they would have to contact an auctioneer, not in our part of the country, in order to receive the best amount for them. This is because I happen to be a Milwaukee Road fan but I live in the Cleveland area. Out here guys like NYC, Penn, B&O Erie, etc. not the Milwaukee Road.
It is something to think about when you make your purchase selections: What is the expected future value of your trains? Do you really want to own them enough considering that most of the value of them will be lost at the time of purchase?
Paul Fischer