The EL (Erie) had automatic OS'ers on the 1st Sub Divn between SN and North Randall. I'm not certain if it was in the double track era or after the line was reduced to single track but I think it was the former. When a train passed a location---Solon, Mantua, Jeddoe or Garrettsville, or wherever they were, one of those points the automatic OS'er would send out a code on the DS line, and it would continue to send the code until the DS would 'ring' it off. Each of the locations had a specific code, such as 2 long, 2 short or 1 short, 3 long, etc. By the time that I started working in the DS office (on the first sub) in about 1967, they were gone. You could not rely on them to report a train 'clear' but you knew where the train was. Hopefully Cal Banse can add to this info as I'm certain he used them. SMT ------------------------------
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