Todd,
You'll find a great deal of information on the sounds that these trolleys play if you go to this link, but most of what's there applies to the versions fitted with ProtoSounds 1, which are those with Product Numbers ending in '-1' rather than '-0' like yours, which only has simple horn and bell sounds:
MTH 30-2512-1 Trolley Sound (9/4/2013) |30th St. Station
Aside from sounds, there also appears to be a running discussion in the background covering the varieties of versions/color combinations/road names that were produced.
Mike