So how do you all set up mining?

So, people only use bidirectional for the abillity to back up out of stations. Doesn't that get a problem when multiple trains are set up to go to the same station? You just need waiting bays or a stacker, and to signal things properly. Many people who use bi-directional trains will also have a mos...

So, people only use bidirectional for the abillity to back up out of stations.
Doesn't that get a problem when multiple trains are set up to go to the same station?

For my first post, I thought that something simple would suffice
So what ratio do you use for trains?
And with that, do you put multiple train layouts in the same system?
And last, do you connect all your rails, or do you keep different lines seperate?