We went to a meeting with the city folks. They didn't understand why we would dig in the woods when there was a perfectly good bmx track in the same city...
They put up new signs (no trespassing) and a new fence. They informed the sherrif to start enforcing the signs. I have only been part of this trail crew for two years but I guess they have had some folks arrested in the past for trespassing, etc.
We mentioned catty woods, insurance, etc. As well as mentioned other public trails that are much more than a bmx track. Their ears were deaf to our plea. We may be getting HUGE fines as well. Only time will tell.