Thanks G-Man.
It seems that the "R" status for the 3rd Engine on the 1st alarm is inconsistently applied, at least on the cards you have shown. It applies to a relatively quiet are like E61, but not on a card for E96 or for the Boston & 164 St. card. Does anyone know when that took effect and did it only apply to certain areas? I don't remember seeing it in the Department Orders, but several of those are missing at Mand.