That frequency information is correct. I checked with a buddy of mine who works out there. There's a rumor they're getting a completely new radio system sometime next year for both PD and Fire since the FCC is starting to push out Lowband stuff.
I know that coverage out there is spotty at best. I've been on scenes and havent been able to hit a tower with ANY of the Med Channels that are used off the Springfield OR Ware/Monson/Palmer areas.. its a logistical nightmare!
As of right now though, they're still on 155.6025 with a PL of 91.5