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Hot Boxes
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CSX in Maryland used to have a revolving white light on a signal mast for the caboose personnel to see to let them know their train had actuated the Hot Box Detector. At one time, there was even a Message Board that would allow you to read which axle had the defect. But, we all know what happened to the caboose era. We tried "Talkers", but, if the airwaves were busy with other radio traffic, the HBD would "wait it's turn" to talk to the train. But, when running a train at 125mph (better than 2 miles per minute), the train could quickly be out of the range of the HBD radio! Our HBD data is now, for the last several years, transmitted to the CETEC Control Center in Phila., PA via modems. If the mainframe computer there receives an HBD alarm, that computer will send out a command to drop the home signal at the next interlocking that the train is approaching to a Stop Signal. In my earlier post, a lot of our "no cause found" for an HBD alarm is due to the Tempil Stick allowing for a higher temperature than what are alarming criteria is set for.
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