3 way, 2 rail T intersection designed for 1-2 trains. Foot print is 70x30. Scores 81 using intersection benchmark mod. Using 2-4 trains gives a score of 63.4. No worries if this doesn't meet whatever performance threshold there is.

https://i.imgur.com/4n0hmeT.png

https://i.imgur.com/uukWM00.png ...

I played around with your design. I didn't want to rely on bots, but was having trouble figuring it out until I saw your post.

https://i.imgur.com/YkBzEfS.png

0eNrtHe9v47rtXwny2bmzfliWit0G7PuAAdu3e4fCSZzGe4md2U7vdYf+75PtNHESKabE5preK1CgduKIFEmRFEXSP8bT1TbdlFlej+9+jOdpNSuzTZ0V+fhu ...