The layout I'm building has a double mainline and what I wanted is the appearance of a locomotive going off in the distance and returning from the same direction rather then having it circumnavigate the world. So I knew that I needed a reverse loop and since I had a double main it needed to return on the other track. Well now if you add two double mainlines then you will need two reverse loops! Now to make things really fun both mainlines "ended" in the same corner of the layout since the other corner had a large locomotive service area with roundtable. I came up with the following design which will be hidden under a mountain and not quite so symmetrical. This section will need to be automated with a built in delay.