Originally Posted by fisch330:
Hard to justify "superelevated" track for straight sections,...
If you try to imagine including the detailed instructions on how to assemble "junior's" little electric train set and explaining the concept of unique transition pieces to go in & out of the banked turn sections, versus the flat sections, and in what order to put them together, it becomes very clear that it was much easier to make them all super-elevated.
That required no special attention or directions at all(as long as the track pins weren't moved around), and it was easier to sell more track at the hobby store.