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Try following one using Close Call(or similar technology)? Lol. If I couldn't find a freq, that's how I'd do it as a last resort.
Us old school guys are hardcore and use frequency counters and spectrum analyzer equipment to get the job done.
I have caught a cab operation in the 451.x0000 range using two repeaters. One is the dispatcher the other for cabs in the field. I have caught another operating on an LTR system using LCN 09 (937.2000) with the dispatcher on TG 0-09-002 and cabs with individual TG ID's in the 0-09-xxx TG range responding to the dispatcher . (Turn the TG delay off on the scanner)
Not sure if Union is using either of these setups.
Might look at other names on the license. Metro is using licenses from the old Ritz cab after buying Ritz out to get its PUC permit. Union may be a doing business as (DBA) with a parent company holding the license.
Thanks for all the help, guys. At this point, it looks like Phil found the one I was looking for. I think it's the LTR trunk with the home channel of 937.2, and dispatch on 0-09-002. This whole thing has been pretty interesting, and I appreciate everyone's input.