I have:
--four of the Western Hobbycraft trolleys
--two MTH ones (Brill and PCC equipped with a sound file from a standard-gauge trolley) that I did voiceovers for
--MTH and Third Rail Electroliners
--and a Third Rail Greenliner.
As you might've guessed, these are all 3-rail. I've been interested in acquiring other streetcar/interurban/light rail models, but the constraint is always powered trucks for 3-rail track. (an earlier discussion on the matter)
---PCJ