hello, guys! I play cs1 through pc on xcloud and I need help to remember something I did a couple of months ago.

I have circular subways and non-circular subways in my city. On one of the non-circular lines, I managed to make both sides of the track at the final stop be used, but I don't remember how. The only thing I remember is that I added a stop after the last one, then deleted it and the game fixed it "by itself", making both sides of the track useful to avoid train traffic. Has anyone done this and could help me remember, please?