The title says it all really
I used to have a railyard beside the station (using DoCoIIIMoSa's beginner railyard blueprint if you need a visualization: https://coigame.com/Blueprint/Detail/2478), tore it up later, but the lines sometimes appear
This doesn't go away on reload, nor are the old waypoints present in the waiting bays section of the line manager
not harmful, but noticeable