Trying to set up a 3-stop metro line from city center to southern and eastern suburbs. I would like it go A-B-A-C, but every time I choose A as the third stop (no matter which platform), the line closes and I can't add any more stations. If I then add C, the line automatically goes A-B-C. If I then add A at the end of that and move it up to position 3, the line isn't closed. Anyone figure this one out yet?