A bus, or a train? Technically a bus, but run like a train. This is the Nagoya GuideWay-Bus, where guideway bus would run along the "rail" between Ōzone station and Obata Ryokuchi station.

entrance to the rail (road)

elevated road (rail) for the guideway bus

to keep the bus on track, (horizontal one) wheel is installed on the bus.

on road, the wheel is retracted.

platform of the station ... very simple. And does it have departure melody? well, sad answer, no.

so is it a train or a bus? I can only say that according to law, the elevated part is "rail". well, sort of a train?