This "Pacific Unified" railroad police sounds reminiscent of a guy named Nemec who, among other things, got a Federal rap for impersonating an FAA official at the San Jose airport, got on Capitol Corrider trains and started bossing people around as a supposed Caltrans official, went up to Rio Vista Jct. and bamboozled some members into letting him be a security guru, and--most famously--impersonated a peace officer and brought parole violators into the Solano County Jail (this ended when he caused an innocent person to be wrongly incarcerated, and he ended up doing jail time himself). He was also suspected of getting on Caltrain's radio, impersonating a dispacther, and trying to give trains operating instructions. There was also a case where someone claiming to be railroad police was issuing parking tickets and collecting fines (the name "Pacific Unified" sounds kind of familiar in this regard, but I"m not sure)--don't know if it was the same guy, but it sounds like his m.o. Deja vu?