Oh boy, get ready for a huge list! A reason it may be so long is probably because I'm trying to be as specific as possible with model names. But still, it's a very huge list. (This excludes sirens that other enthusiasts brought to SirenCon 2022, as I attended) I might add to this list over time, I definitely forgot something.
Federal Signal (and FS&S):
2001-SRN
2001-DC
2001-130
2001-DC Round-back
2001-SRNB first gen
2001-SRNB second gen
Model 2
Model 3
Model 5 (maybe a 7 too?)
Model A
Thunderbolt 1000
Thunderbolt 1000T
Thunderbolt 1003
SD-10
STH-10
STL-10
RSH-10
Eclipse 8
EOWS 1212 prototype
EOWS 612
MOD-2008
MOD-4016
MOD-5020
MOD-8032B
2T22
3T22
508
DSA
Sentry:
7V8
10V
10V2T
14V
15V2T
16V1TB/20V1T
20V2T
ASC/ACA:
T-112
T-121
T-128
EAC T-128
E-Class 4
Allertor 125
Screamer S-10
Banshee 115 (dual toned)
P-15
Alertronic 6000R (active one and an abandoned one in a forest!!)
Alertronic RE-1600
Whelen:
Vortex/WPS-4000
WPS-2904
WPS-2910
Hornet
WS-2000-109 (2000-115/2016 but two arrays missing - Lexington, Kentucky)
Other:
Fedelcode Model 2
Fedelcode Model 5
Fedelcode Model 5-QC?
Fedelcode Type B
Loudoun ES-4000
Loudoun ES-5000DC
Sterling M-10
Darley 3V8
VXS4006 (owned by me)
VXS9050C (also owned by me)
Werden P-127
Werden B-115
Darley Model 5
Darley Helmet
The Botkins creation (Fedelcode mystery siren in Botkins, Ohio)
HOR Super Sirex (type 15)
HOR Sirodrone
ATI arrays in a tunnel
Aaand I believe that's all... I don't know how I've accomplished it. Sorry for the mouthful of text (to say the least

).
Pretty much nothing can beat listening to Danny Harmon's railfanning videos while hunting for railroad signals in the middle of nowhere Ohio.
- Johnathan “JP” D.