Windows 10 Build 19042.1237 (English (UK))
Application Shell: 3.07
Two events occupying the exact time span do not align in Subway (screenshot 1). This can be produced in a clean file (screenshot 2). Create a new file using the novel template, default settings. Create two events on the same day, same time, three hours duration. Create two characters. Add one as a participant to one event. Add the other as a participant to the second event. The two events are misaligned in Subway.
Edit: Thinking about it, I can see why there may have been a deliberate design decision to do this, to avoid simultaneous events potentially overlapping and becoming unreadable. Still, it is confusing, and - down the road - I think there needs to be a solution for this - say like a broad vertical connection between such events similar to the London Tube map where two stations are connected on foot.