Yes, I know that holding the shift key will prevent tracks from snapping to existing spline points. But doing so also prevents the creation of junctions. So what should I do if want to connect to tracks with junctions but the ends keep snapping to other spline points? There doesn't seem to be an option to create a junction from a piece of track that has been placed by holding shift. Sometimes it helps to start or stop building the connection track a bit away from the desired point and then move the junction point afterwards. But somtimes things are so tight that no matter where you click there is a spline point nearby that makes it impossible to create the junction.