Basically all Des Moines uses now is T-128's and the suburbs use Whelen's and 2001's. Our last old system siren, a Whelen 3016 in Urbandale, IA was replaced by a 2001 in January 2019. My fam did transport a Thunderbolt 1003 from Johnston, IA to Crosslake, MN in the 1990's so that does give a few clues
Any info anybody has on the old systems would be greatly appreciated!!!