UPRRPD is typically dispatched off of cellphones. They have access to all regular rail channels, and if actively operating will be on local road or yard channels.
Depending on location and involvement - they may have access to local law enforcement radio systems.
You will see quite a bit of listings showing 160.205? as RRPD channels, but in contemporary use, not really used or allocated. Back in the day in major metro operations it was quite possible, but with cellphones and other means, not so much. Not to say it isn't used, but all the RR cops that I have spoken with didn't know anything about it in our patrol zone (CSX, Amtrak, other local RR's that had PD's).