Bruce,
Enjoyed the video, great layout!
Gargraves definitely has a more square profile than regular tinplate track. I use Gargraves on my Hi-rail layout and my friend Murray who is a live steam operator, modifies the gauge of Gargraves to run his smaller steamers which often have shallower flanges and won't tolerate tinplate track. My Weeden Dart will not run on the rounded rail profile of tinplate track. When laying my track for electric use, I use conductive grease on all the rail joints and I find that it improves the conductivity.
Eric Hofberg
TCA, LCCA