I'd gotten some questions about buzzer circuits, and finally dug out my wiring diagram -- from 45 years ago. This was drawn for car 309, but I believe the circuit is the same for any CA&E car, except that the interrupter may be at the #2 end, and of course for the steel cars the buzzer is connected not to line 7 in the control circuit, but the buzzer jumpers. The buzzers will have a typical value of about 500 ohms.
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