Discussion related to commuter rail and rapid transit operations in the Chicago area including the South Shore Line, Metra Rail, and Chicago Transit Authority.

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  by MetraBNSF
 
I don't know if this happens on other districts, but on the south side of CUS, when trains are switched from station power to HEP, on occasion there is a buzzer that goes off in the cab car. The buzzer sounds for several seconds after station power is turned off and will continue sounding until HEP is activated. If a cab car is positioned anywhere in the middle of the consist, the buzzer goes off as well. Does anybody know what this buzzer in the cab car is?