Hi Chris,
Your question immediately brought visions of Judy Garland in my head singing:
Clang, clang, clang went the trolley
Ding, ding, ding went the bell
Zing, zing, zing went my heartstrings as we start our day at Disney World!
Okay - so maybe that's not really what she sang but I like my version. Alas, I digress - back to the question at hand.
Great news! The Main Street Trolley show is still performed daily on Main Street. I checked with a super helpful Cast Member regarding the entertainment schedule at the Magic Kingdom. Currently you can see the performance at 9:15 a.m., 10:15 a.m. and 12:05 p.m. Its a fun way to get your day off to a super start. The schedule is always subject to change so be sure you pick up a Times Guide when you enter the park. If the times aren't listed, check with Guest Services or a Cast Member along Main Street.
Wishing you many magical memories :-) Allison