Hi,
I have searched for a long time, including the five weeks we have been in Portugal for a reasonable map of the LISBON Tram 28E path. I haven't broken down a cried, but when my wife found this: http://www.seewah.com/tram-28-lisbon/ I did nearly cry, for joy.
I am busy enjoying my time in Lisbon and have not looked to see if the sam is available for the #15E and #12E. Ricks guide book has a map of these, but they are pretty vague if you are looking to know where to hop off or on they don't quite do it.
wayne iNLIsboa