What are they waiting for?

Look at the photo. What are these people doing there? They are waiting. Apparently they are waiting for something special, for all have their faces in more or less the same direction, the direction where the object they are waiting for is or will come from. It is obvious what this object is: It is the tram in front of them. By they don’t go into the tram. Why not? It is because the doors of the tram are closed. So, these people are waiting till the doors of the tram will be opened, so that they can go into the tram. They are not so much waiting for the tram itself but for a certain event related to the tram. While waiting, some people are watching their smartphones. Others do nothing special. They are just waiting.
But look to the people at the right. They are looking at something: They are looking at the man near the front door of the tram. What is the man doing there? He is opening the door of the tram, for the man is the tram driver. Yet a few moments waiting and the doors of the tram will be open; people will enter and the whole scene has disappeared. And that was actually what these people were waiting for: for the end of the waiting.