The photographer Luis I. Sánchez made the most of this trip to Mexico City to visit the metro system and take this cool photo of the Copilco Station, close to the campus of the National Autonomous University of Mexico (UNAM), and the penultimate stop along the southern portion of Line 3 (the olive green one).
By using long exposure techniques when the train was crossing the statin, Luis I. managed to obtain a photo where the train looks like a perfect and coloured wall.
You can see this pic with a bigger resolution on the Facebook site of the photographer.