We are all familiar with the Federal Q2B that is on basically every fire truck known to man, but how many of you are familiar with the Q2A? From what I can figure out, it is an older version of the Q which is characterized by a slower wind up and lower peak pitch. Here is a video shot in Waynesboro, Pa of Waynesboro's engine, Blue Ridge Summit's engine and Leitersburg's engine all going to the same call, Leitersburg's engine has a Q2A siren on it. You can skip to :55 in the video to hear it or just bask in the glow of multiple Q's back to back with the Q2A as the final piece of the puzzle.
https://youtu.be/6coQNsvVevE