The Tren Urbano is a new star in our urban landscape. With time, we shall become aware of its revolutionary presence, and change our conventional image of the city by gazing at it from the train cars. A different city, at once fantastic and ordinary, will reveal itself to the train's passengers. Moreover, the Tren Urbano is a place, like the communities traversed by it. Passengers will use the train as an entry and exit point into daily life. To those who live in its vicinity it is a claimable landmark. Art proposed for this site must reconcile local character with the overall metropolitan scope of the route. Given the technical uniqueness of each station, proposed works should be limited to the sites specifically identified, which were selected after a thorough analysis of the operation.