Yeah, I've heard the big single-chimes referred to as "blats", as well. I guess we called them "foghorns" out West because they sounded, well, like the foghorns the Coast Guard used out there, especially in the SF Bay area. Makes sense, since SP's HQ was downtown SF.
Nothing quite like a still, foggy Bay Area morning with multiple horns in conversation, off in the distance whilst enjoying a coffee and scone. Most evocative.