After a few livestreams thinkering up a shunting system for my yard without computercraft I came to the realisation that even though I had a system that worked, due to some bugs it sometimes needed manual work on the track to realign it to stations. Because I want full automation in my world this was a no-can-do so I decided to work on this little thingy ;
My new shunting system is as the title says, modular, customizable and automatic. The monitor gives me information and allows me to select a few things ;
Information about wagon slot occupation and max wagon amount per track,
Track selector to decide which track to shunt to,
Decoupler selector to decide where I want to split the cars (aka which ones stay, which ones get taken)
And a nice little shunt button.
The redstone in the system has some failsaves and overrides, including if you select a coupler further than the total train length, the whole wagon set would be left behind.