>> I still haven't heard from anyone about these cars negotiating American Models track and switches
My suspicion is that there are not very many folks using AM track. No facts, mind you, just a suspicion.
>> I have ordered several of these hoppers now and feel pretty confident they will run smoothly on my Lionel American Flyer Fastrack loop as all American Models and S-Helper-Service so-called "scale" wheeled cars run just fine on that loop of track.
If you do not have any switches on your loop of track, then most anything will work. Once you have switches, the problems will become apparent really fast. You should consider making a decision on what kind of switch you want and then be sure that whatever rolling stock you purchase will be compatible with your switch choice.
I'm really a high-rail kinda guy and am attracted to the colorful cars being offered by Lionel.
I'm a scale kinda guy and am attracted to things that are unique and special. I have enough brown box cars for two lifetimes. Not to mention black hoppers. Those Canadian paint scheme are certainly appealing. The fun part is making them work on NMRA-scale track. Sort of like a kit-bashing project. Not a big deal, but it sure would be nice if Lionel did it for me considering the prices being charged.
Pizza-cutter wheel flanges or "scale" flanges make no difference to me as long as they run smoothly.
Be aware that both ACG and scale flanges will not both operate well through the same switch. The one exception, I believe, is Tom's Turnouts which can handle both types of flanges. If you are using something other than Tom's, you might have a disappointment waiting for you just around the bend.
>> "Lobster-Claw" couplers are fine by me also.
If I can put together a Kadee-couplered train I'll run it also.
Coupler choices are many, but do not affect the ability of the trains to stay on the track.
>> Hey...if you're having fun that's all that matters!
If fun is the goal, then more fun is even better.
Cheers...Ed L.