1. In the U.S., we tend to say, "On foot, Stop X is a straight shot from stop Y." or, "You can walk three stright blocks from Stop X to Stop Y.
2. You would not use desert in this manner. It should be, "Due to an incident, the metro will not stop at the following stops: X, Y, and Z.
3. The metro is down at the moment, but will start running again at three minute intervals