Never found ground transport freq's but I monitor lifeflight Air, dispatch here in salem on two different systems. Number 1 is the oregon state system using a BCD325P2 without any issues, monitoring in single CC mode 769.46875 MHz, system 000A - site 0303 on Talk group 9161.
The 2nd system where I monitor Lifeflight dispatch is on the Portland P25 system also in single CC monitor mode. System; 03CC- 0123 on either Goat Mtn CC 773.48125 MHz or east simulcast CC 773.48125 MHz on talkgroup 2009.
Not much talk aside from dispatch and some amin stuff but they are there.