A few more: you have trains where the shape of the bullet (circle or diamond like (7) or <7>) differs and has different stopping patterns. The train stops chang

A few more: you have trains where the shape of the bullet (circle or diamond like (7) or <7>) differs and has different stopping patterns. The train stops change between daytime and late nights, as well as weekends and weekdays. In case of signal malfunctions trains can be dispatched to go anywhere just to clear congestion, like F not entering Manhattan or A going to queens (both actual examples in the recent incident at W 4 St).