In a local municipality, there is a long disused system consisting of what I believe are Federal Model A sirens mounted on utility poles next to the larger intersections in town. These sirens were used to warn of an approaching emergency vehicle and controlled by dispatch. An approaching vehicle would radio dispatch to activate the siren and radio again to turn it off. That’s all the information I was able to get. I don’t know when the system was installed nor when it was removed from service.
The municipality also had a Gamewell system at one point and had the Diaphones (Horns) on one of the stations up until a few years ago, though the system hasn’t been active for around 15 years.