Last night I was at FW and we rode on the first electric bus. It was so quiet and runs primarily on electric power. There is a diesel generator on that back (which is also really quiet) that comes on when the bus stops to power the batteries that keep the bus running. The driver was very excited about it and said more buses will soon be added to the fleet.
Also, the other buses in FW have been running on bio-diesel for some time now. I love that they are trying to do their part and trying to lessen their impact on the environment. I’m sure that is not the only reason, but the bus was really nice and very quiet. As a FW guest, you appreciate the quietness.