PC: hotbox detectors

[PennCent <penncent@xxxxxxxxxxxxxxx>]

I'm collecting recordings of talking hotbox detectors, of any railroads 
but mostly Conrail. I don't know much about the history of these 
devices, and don't know if they were around back in Penn Central's time, 
but if they were, and PC had them, does anybody have any recordings of 
them they would like to share/trade/sell? I would supply the tape or you 
could just send them over the internet.   Don Narris--Canton, Ohio