I have some business in DC today and went down on NER 111. It was about 10 minutes late into Baltimore (I think there's some trackwork around Martin Airport), but we were going along at a good clip until we were just outside of New Carrolton. Then we stopped dead and sat there while two other southbound trains passed us. We then started moving, and have just left New Carrolton, looks like we're going to be about 15 minutes late. So what's happening? Why did they have the other trains pass us? We weren't that late.