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Hello My name is Larry To answer your question the object that you are looking at is is called a f.r.e.d or Flashing Rear End Device a.k.a EOT or End Of Train it is mounted on the coupler and connected to the trains air line it monitors the air pressure in the line and the relays that to the engineer also should the train break apart it will instantly alert the engineer hope this helps ya Regards, Larry
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