If you listen to the video, the narrator says that the thing sat on the roof of a tall building for ten years, had salt spray on it, and sat in a garage for another ten years. And even without the horns the sound of the thing still drowns out the engine's very loud exhaust.
I think I'll have to ramp up my efforts to get my paws on that Chrysler sitting derelict on the mountain at Cerro Negro. Definitely the ultimate siren!
Charles
Yes, that's a real 500-lb Federal SD-10 I'm holding (braggart!)
Reminds me of when I recorded the Essex Flood Siren Test last year, I was exactly the same! Covering my ears, as the air and ground around me shook with sound. But trying to cover your ears and film at the same time isn't easy!