Shay ... great tips ... words of wisdom ... funny, but all true!
Sgager ...
I appreciate your invitation to share some ideas, and wish you success with the compilation and book. Some misc thoughts ...
I'm a novice RR modeler ... been modeling other things (boats, etc.) most of my life, but got the train bug about a year ago and have jumped into it pretty heavily. In doing so, I was a complete naive novice ... I had to ask members here to explain why some trains / transformers are AC vs. DC. But, ask I did ... then asked some more, and asked some more. My point here is this ... I think I've learned a lot in the past year, but whatever knowledge I've amassed, it's almost entirely due to the INTERACTION and DIALOG with people like the members here on the forum. I did pick up a few books (Lionel maintenance, Lionel history, etc.) which I enjoyed, but the depth of tricks, tips, under-the-hood knowhow has been learned by doing the touchy-feely thing with gizmos (motors, frames, trucks, etc.), getting stumped along the way, then having guys here actively point me in the right direction and steer me along the way. I've found this method so enormously helpful that I'm somewhat reluctant to delve much further into the published book sector of research. Don't misinterpret that ... I'm all for reading and learning. But it's the interactive aspect of things like the forum that I've found offer more productivity for the end user (especially novice ones like me), and hence, yield more bang-for-the-buck on my end... where "buck" equals TIME INVESTMENT, rather than cash outlay.
So, that all said, if I were to steer you in any way, it would be to devote a section of the book to point RR hobbiests towards places (local clubs, national clubs, internet forums, etc.) where they can dialog with others sharing the same interest and with people who have a wide cross-section of skill levels. In regards to that last point, I think I've learned just as much from asking questions of pros here on the forum as I have trying to formulate my thoughts and understanding of a technical issue so that I, in turn, could offer a response to some new novice here on the forum. You learn both ways, so to speak.
There is one other issue that's important to me (and I suspect many other RR guys) that I suspect is NOT covered very often in existing books and such: researching and promoting the nostalgia end of things. What do I mean by that? Oh, sure, there's scores and scores of books that will step you through the history of Lionel, Marx, American Flyer and the like ... the company, the trains, etc. All good. But what fascinates me is more about the people who have USED the trains that I have (some family relatives that I know about, but more often, unknown past folk who were owners / caretakers of stuff I've purchased on ebay). Who were these people? What got them interested in their trains? Did their kids enjoy them? How many generations might have shared in the joy of watching said train run around a tree at Christmastime? Sadly, for many of my trains, those questions are lost to history and can never again be answered ... at least when looking at the past.
Which brings me to my next point, and my suggestion for your book ...
All of us in the hobby are building legacies and nostalgia for future generations, regardless of whether we think of it our not. Chances are that many of our little toy trains will be around here on Earth far longer than many of us. Who will they get passed down to? Who will use them? Will they share in the same family traditions?
And to answer those FUTURE questions, I think it's important that we all begin to document a bit about the legacies of our trains that we are all building now. Write it down. Stick a few notes inside the loco cab. Glue some photos to the underside of the layout table. Share some project laughs on a "lasting" media format, perhaps like the forum here.
I suspect many modelers focus on enjoying their trains today. Nothing wrong with that. But it might be that a new book with a not-so-often-written chapter about promoting, documenting, and investing in developing a legacy of trains, family, lore, etc for tomorrow's modelers might spark some extra interest, and promote a bridging of knowledge between generations.
My two-cents, anyway...
Good luck,
TJ