Some days I spend a lot of time waiting for trains, some days I don't. Metro has no idea what a schedule is or how to stick to one. They may post a suggestion of a schedule online, but it is merely a suggestion. The displays in the station give you some general idea of when a train might be coming, more or less, and maybe in the order they are posted. When I was growing up my father told me, "never run after a street car or a woman, there will be another one along in a minute." I now understand why my mother always turned blue when he said that, but he had a point. I have learned to never run after a train, there will be another one along, sooner or later. As for women, I never run after them.