Source: WGBH U-matic tapes
Date: September 29, 1986
Siren(s): 1982 Federal Signal EOWS 115
Location: Middle Street, Plymouth, Massachusetts
Fate: Replaced with Modulator 3012 in mid-2000s, Modulator decommissioned in 2019
Raw clip of test (siren not visible, but confirmed to be 115):
https://www.youtube.com/watch?v=SqD8x4caIDk
Final edited story (several 115s are visible and audible):
https://www.youtube.com/watch?v=bbXsuPpEAbE