In Pierce County, on the SS911 system, talkgroups 59197, 59198, and 59199 are WSP simulcasts of Tacoma WSP East, West, and Tacoma C2C so any radio on that system (police, sheriff and fire) can switch to, and communicate to WSP base or mobiles.
With that said, could the 59xxx talkgroups you guys are wondering about be the same on other systems in the state? Per a trooper freind of mine, he says any first responder in the state will have the ability to switch and communicate to the specific WSP dispatch and mobile channels in their area when the project is completed.
So possibly,for a specific 59xxx talkgroup to work, it would need to be programmed into the SYSTEM it is accociated with to be heard?