@locopilot750 posted:We always had somebody out of service over it. If you google FRA horn rule, I think it's about 54 pages long.
Geeze, to paraphrase an oft quoted (true or not) Elvis line: "The common sense has left the building!". Some bureaucrat(s) must have had way too much time on hands, and wanted to insure every i dotted and T crossed for every possible scenario.