Hello Everyone.. I'm quite new to this. I'm just now starting the planning for a G scale railroad in my backyard. This is my first try at this hobby, although it had caught my interest for years. Well...here's my first question. I'm planning to run the line around my pond, which is 12'x7'. In order to do this, I will have to climb a grade of approx. 2' 4". Up on side...a 90 degree turn...then back down. My question is is what are the grade requirements...ie...how steep is too steep. I do have room on each side to make it gradual...with tressels. Thanks ahead of time for all your help. I'm sure I will have lots more questions as I plan this.