They are still on T band in Delco, however for the last few years they were considering going to the 700 trunked band, not sure when, from what I hear monitoring delco, it seems to be all of delco on t band, some fire districts and fire police have talk around repeaters I guess for fireground operations instead of using the county system, other times on fireground it seems to be simplex t band operation.
I did hear in the past speaking to fire police, that if a large grid needs to be shut down and traffic redirected due to fire ops they sometimes have trouble communicating to each other with portables on t band, seems to really be line of sight.
I think fire police district 1 & 11 have access to a talk around repeater or so that’s what I’ve been told, I have not verified this.