This post is a bit short and the bottom, add the subways want to google maps?, Is very easy, go to: http://goo.gl/maps/4Bs2
If you got google account (@ gmail.com) can save a map as yours (Use “Save to My Places”)
Also take into account that you can work on your phone (if smartphone)
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Some time ago there was thinking of doing a sort of google maps application for the subway, I was (ok, not me, sofy) each subway station (90%) and take pictures.
More info about the time: http://eltecnoloco.com/proyecto-subte-subway-argentina-subtesubwayargentina-com