I believe R2s Mack bulldog rig eventually wound up in Rescue 3 when it was located with engine 71 and the 7th Division on Park Avenue in The Bronx. In those days the 7th division covered the entire borough, commanded by Deputy Chief Hugh Halligan, who happened to be my father's "rabbi". Halligan often detailed my dad as the officer in R3.
That firehouse was located in my father's old neighborhood and occasionally we would go back to visit his old stomping grounds. That meant bouncing to every gin mill from Hegney Place to Brook Avenue, and of course, a stop at E71 to pay homage to his mentor.
One of my earliest memories as a pre-schooler was looking at that Mack Bulldog rig...my eye level saw the chain drive on the back wheels...1920s technology. You can see it in the photo of the rig when at R2. A long, long time ago.