Late last year I stumbled across what seemed like an interesting find and bought the McGraw Hill Electric Railway Directory - 1924 at a used book store here.
It catalogs every electric RR and trolley system in the nation that year: even tiny towns had them.
The book lists Charlotte NC, even in 1924, as having two: an electric RR with 206 miles total track connecting it with Greenvilee, Gastonia, Mt. Holly, etc., and serving some trolley functions inside the city with "motor pasenger coaches" all running at 1,500 volts , and a public service trolley company with 27 miles of trolley lines locally and four trolleys, one of them a large "60 passenger" model, running at 600 volts. Both were 4' 8.5" gauge.
I find it fascinating that this was 88 years ago and that no sign of so many of these systems - once in just about every big and small town, exists today.