I am back on the ARS board after "lurking" for quite some time. So, I found this NRC document on accident and found out that the VC Summer Nuclear Plant in South Carolina formerly consisted of dual-toned ACA Banshees, dual-toned ACA P-10s, single-toned ACA Screamers, FS Thunderbolts, and t...

Looks like you posted the link 67 seconds into the video, skipping the windup. Other than that, good video. I really like the RM-130s.

There's already a map for Ontario...it is a bit old though.

https://maps.google.com/maps/ms?ie=UTF8 ... 8cf309&z=7

As far as I know, my county's (Kosciusko County, IN) sirens only go off for tornado warnings and sound off twice annually for the Indiana Statewide Tornado Drill in March. There is no fixed testing schedule. There are fire sirens in the county that sound off for a noon blast daily or weekly, but the...

Where specifically in North Dakota would this be?

Very well done map! You are obviously the first to map out (almost) all of the Beaver Valley sirens. Definitely worth all of the time it took you.

Very nice work

For the California map, I found a couple of sirens via Google Street View:

Orick, CA: Volunteer FD has an STH-10. Current as of June 2018.
41.290667, -124.057000

Trinidad, CA: FD has a Model 2. Current as of October 2017.
41.059914, -124.142937

I got a 404 error when I tried to view it...

Thanks for sharing this. Pretty cool hearing one of these beasts in action.

Compared to warning sirens, train horns are somewhat quieter. Most put out 100 or more dBA at 100 feet, making them not as loud as many of the most powerful sirens made today (2001, T-135 AC/DC, etc).