How can I add another route to my existing routes?

[Anonymous]

Hello,

I am seeking your expertise help in figuring how to have an additional continuous route through my tow layouts.

First, this is my N-18 layout plan:


I am going to add another 4x8 next to it with this plan taken from "101 track plan". Thanks to Steve "Gray One" who added some yards for me:


At present time, I have 4 tracks and I am running 4 trains on it non-stop and each one going different directions. Here is how they go; there are arrows for each train direction:

Now, here are the two layouts toghter, and I would like the yellow line to go into N-18 and still keep 4 routes:


If I do it this way, I would have just 2 routes:


I would like to have 4 routes if possible. If you have time, please help.

Thanks.

Mo:-)