Hi guys,
I'll second the topics of ground planes and the assorted modules. A review of the modules should include...
-Original TMCC components (CB-1, Cab-1, SC-1, SC-2, new ZW, Power Masters, etc.)
-IC-Controls components (ASC, ARC, TPC 300 & 400, etc.)
-Legacy components (CB-2, Cab-2, ZW-L, Power Master Bridge)
-Third party TMCC compatible components (Z-stuff DZ-2500, DZ-2001, etc.)
Information on pinouts for making cables would be very useful, including the pinouts of the Legacy Y-cable.
There should be a chapter on conventional control that explains the functionality and idiosyncrasies of the Power Masters, new ZW's, ZW-L's, TPC's, etc. You wouldn't need to repeat things that are explicitly in the user manuals (like how to program the ID's or starting voltage), but a comparison of their merits for different applications would be useful.
There could be several chapters related to locomotives. One chapter should cover the various generations of Railsounds up through RS5. Another chapter should be dedicated to variations of Legacy engines (w/ or w/o Odyssey II, RS5.5, etc.). Perhaps the most useful chapter for folks buying used engines would be a review of TMCC licensed hardware from TAS, ERR, K-Line, and Digital Dynamics. It would be very useful to get that info in one place while it's still easy to find manuals for some of the electronics that have gone out of production.
There could also be a chapter dedicated to computer control options. It should explain the capabilities of the various TMCC compatible software packages including JMRI, Rocrail, RR&Co. Train Controller, and Kam Industries Train Tools.
There's probably a good chapters worth of TMCC enabled accessories as well. Lionel items like the operating crane car and command enabled FasTrack switches would be a must. Other third party items like the TAS smoke fluid loader, Z-stuff DZ-2000 switch machine controller, and Ross turntable would also be helpful. You could also include ASC, SC-1 and SC-2 wiring and programming instructions for conventional accessories such as the Atlas turntable, Tortoise switch machines, and Lionel magnetic crane.
One thing that might work well as an appendix would be a series of Cab-1 button overlays. You could include the generic TMCC steam and diesel overlays as well as some of the special overlays such as the Acela and operating crane. If someone lost an overlay, or purchased one used and didn't get the overlay, they could print a copy on a transparency.
There's a LOT of good stuff out there for TMCC and Legacy. Third party items have greatly expanded the possibilities of the system, but they also have left a hole in the documentation of how to integrate non-Lionel items with Lionel control hardware. For newbies who haven't absorbed the institutional memory found on this forum a comprehensive book could be of great value. Barry's experience with digital and on-demand paper publishing has proved there is a market for this type of book and a feasible means to bring it to the public.