To give a backstory, Schenectady was a vital manufacturing hub during WWII, as it had General Electric, American Locomotive, and other businesses in the area, on top of the Delaware & Hudson railroad, an important shipping line for Canada and the rest fo the northeastern United States. Locally, it was much different than surrounding cities, whose primary industry was textiles (hence the name "Leatherstocking Region" is often used to describe this area of New York, in addition to "Capital Region"). Thus, Schenectady invested in an air raid siren system quite fast.
From what I could gather on the "OCD Siren Funds" document, the city of Schenectady itself purchased 4 Thunderbolts, and 4 SD-10s, while Schenectady County purchased 10 sirens in the SD-10 class, and 60 sirens in the Model 2/Little Giant class. At first glance, I thought that "60" number was a mistake, but I have come to learn that it may not be as outlandish as I thought. Curiously, the City of Schenectady did have a Sterling Little Giant at Fire Department Headquarters, after the department was formally organized:
Whether this was relevant to their Civil Defense system as some sort of precursor is unknown to me. What is definitely known is what remained post-Cold War.
Two Jailbar Thunderbolts remain; one on the former Freihofer building, 1237 Albany St., and one on the former Euclid/Bellevue School, 2020 Broadway.
The Euclid Jailbar tipped over sometime after the school closed in the early 1970s, and remained that way for some time. You can still see the horn in the corner of the building.
Only one SD-10 still stands today--located at Yates Magnet school on Salina St.
Removed but confirmed SD-10s were located at:
Carman Fire Department (no image available), Rotterdam Town Clerk's office, Scotia Fire Department, Schenectady City Hall, one on a pole at 1134 Balltown Rd (an old football field, no pictures), and finally, 3002 Albany St. (formerly SFD Station 8):
This is as far as I have been able to take as certainty.
One Jailbar Thunderbolt has been alleged to be at Sacandaga Elementary school in Scotia; however, I have not seen anything backing this up yet, and it being outside the city doesn't make sense to me, but it could still be possible.