Thank you all for the replies and for the examples. In the end I will be going for a uni-directional track. On secound thought I makes a lot more sense in my situation.
For the people that made the examples, I will still be making them to try and understand them better to be able to use it in the ...

This is my first playthrough of the game and i am currently working on a new railroad and i am having some struggles on how to implement something. I have two different tracks next to each other and some track connecting the both of them (as seen in the attachment). I want the following to happen ...