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Retirement Sale: Save An Additional 20% Off of Our Normal Discount Price
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Note
that this is the exact same track plan as the previous example. The
only difference is that the reverse section location has been changed.
Just because it's obvious that there is a reverse section doesn't mean
it has to be where you would first assume. More about that later. |
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For this one, choose a portal to be the south portal, as you would with any other reverse section. For the illustration, we chose the right mainline portal to be the south portal. As with the "Expanding the Reverse Section" example, the other portal on the mainline (labeled with italics) will be identical to the first mainline portal - both south in this example. That means that the other two portals must be north portals. You can use the normal "simple reverse section" numbering method for the entire thing. Starting with the left rail of the south portal being #1 and the other rail being #2, then moving to the south portal and number right to left as 3 and 4, then back to the mainline at 1 and 2 to number left to right as 5 and 6, then back to the reverse section to number right to left as 7 and 8. This only leaves the left mainline portal to number (numbered in italics), which we've already established as being identical to the other mainline portal, and the other loop portal (also numbered in italics) which we can extrapolate as being identical to the other loop portal. We can prove this by moving the "+/-" signs down closer to the portals. If you look back at the testing portion of the original "simple reverse section" wiring segment, you'll see that the +/- polarity for the mainline at the north portal is reverse that of the mainline at the south portal - as it is in this example. |
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