A year and a half ago, I was out riding on the Trinity Trails with my wife. We saw a couple of guys on mountain bikes carrying cases of railroad water near the local UP rail yard. It's easy to recognize because nobody but the railroad supplies water in cases of such small bottles. Later, we saw that they had even more stuff and they were checking out a construction site. I couldn't call the police without being obvious at that time, but I did pull out my phone and make the call a little later. I had a really difficult time explaining to the 911 operator exactly where these guys were. The nearest cross streets were a mile one way or 2 miles the other. After the call I lost track of where they went. They got off the trail near the baseball field north of downtown.