If we want to know every instruction regarding the use of oscillating headlights, we'll need to have a rule book-contemporary copy of the specific railroad's bulletins (which were variously called Superintendent Bulletins, General Orders, General Instructions, etc.) which could modify or supplant that rule book. It is likely that these publications also contained some instructions for use of oscillating headlights, especially on railroads that used consolodated rule books which were adopted by more than one railroad.
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