Don't worry, even if you were in the loop, these are pretty obscure anyway.
Last February (I didn't know about these until May anyway), there was a SW exhibition Imagination show in Philadelphia. Septa (the subway system in Philadelphia) had their tickets with SW pictures on them. There are 11 different ones. Of course, there are variations: Weekly trailpass and for each section 1, 2, 3, 4, monthly transpass, monthly trailpass 1, 2, 3, 4, anywhere.