Goldnut.. If there happens to be a curve within the incline, it adds drag to the train causing train to behave as if climbing a steeper grade. The tighter the radius the more the drag. If your initial calculation is, say 2.5 %, the curve will make train behave as if it's a, say, 3% grade or more...On the other hand, if you only run short trains (loco/4-7 cars) this may not be a concern.. M
I think I may be able to keep the grade increase limited to the straight run but if not this is information I will keep in mind. My trains will just be short for now but over time I imagine that will change. I will try to plan accordingly. Thank you