Mexico City's subway or "Metro" is one of the biggest subways in the world, and maybe one of the best ways to move within the city. It is inexpensive, fast and easy to master, even though, a good map of the stations comes very handy. In order to travel efficiently you would need to know few things: the station were you are, the destination station, the line you need to travel and the direction you are traveling. Even though every line has its number and every station has its name, they have colors and drawings that you could easily identify (this system was developed for people who can't read). Click the link below the image (preview) to download a PDF with a high-resolution map of all the subway stations.
If you have any question or doubts please feel free to leave a comment (or your question) below the post.