The more you go down the stairs, the natural light becomes less, and the crowds become denser, especially in the peak times. When you pass the gate, a mixture of different voices and sounds could be heard, including train announcements, safety warnings, the beep of the train doors and it's loud sound of moving on the rails, as well as the voice of mass passengers waiting for the next train, speaking to each other. Among the commuters, there is a particular group carrying heavy loads in backpacks or suitcases whose everyday journey does not have a specific destination. Indeed, their destination is the path that they go through their moving workplace where looks like a mobile shopping centre. This is Tehran’s Metro, which in addition to 3 million of daily passengers, has placed in its wagons and stations, more than 10 thousand vendors who start their work with the first train in the early morning and finish it in last trains going back to their houses. On both sides of the platforms as well as the first and last wagons of the trains, there are allocated areas for women, labelled “Women Only.”