Derek:
It's a great idea.
One thing you might explore is "How to avoid problems when purchasing certain models". For example, if you were buying a 726 Berkshire, you'd want to make sure that the jeweled marker lights were both there, that all four steps on the tender were intact, and probably a half dozen other things I'm not thinking about. AND, if any of these items were missing or broken, what are some sources for parts and how much they are and how difficult it would be to fix things. If a collector had all that info, he'd 1) know what problems to avoid and 2) when he saw problems, he could estimate the cost/time needed to make the piece whole.
The list of items to examine is a long as what was manufactured during the postwar era: The cracks around FM body screws, restringing culvert loaders, replacing the film drive belt for the 334 dispatching station, putting a new cloth belt on the 364 log loader, etc.
If you made it a video production (versus just listening), you could also offer features on rebuilding things (e.g., how to rebuild a ZW, how to quarter the wheels on your steamer that you're rebuilding, how to replace the brushes, clean the commutator, and lube a 665, etc.
As a complete dinosaur Postwar guy, I'd watch or listen to every one of them.
I hope this gives you some ideas.
Steven J. Serenska
