Decided to finally do a full test of my Federal Sign & Signal Model L (Serial no. 7N11, which means no date code sadly) during today's weekly siren test. The ATIs fired up at 12:30 on the dot, and I gave it a good growl and a few blasts accordingly. Yes, the ATI is broken, yes, it's been reported multiple times, and no, they haven't fixed it...
I'm going to be restoring this Model L cosmetically, as it appears to be already in great operating condition. I'm also planning to restore a first generation Safetran mechanical crossing bell after this!
https://www.youtube.com/watch?v=PRywRO0tuWo