Norfolk-Southern detectors are on the Road Channel, 160.950. They are low powered and placed at about fifteen mile (am I right?) intervals.
Very recently in north Alabama the boxes were updated with a new computerized voice. Got to hear detection messages in the testing phase, "Warning! Warning!..." Some of the mile post reference points were adjusted as well.
Plus instead of "dot" the voice says "point" now when identifying tenths in mile posts. For instance, "Norfolk-Southern mile post four-two-four point two, no defects." It used to say, "Norfolk-Southern mile post four-two-four dot zero, no defects."
To my knowledge, I've nevr heard a railroad police unit on railroad frequencies. For years there was only one guy for all of northwest Alabama. He used to call sometimes for tag or dl, etc. querys. When he retired in the lat eighties or very early nineties, he wasn't replaced. Might be one around now though.
As b-t-s-m said, I bet it's different in Birmingham!
