The Northern California Fly Fishing Board

Just curious, but does the same hold true for river access via a railroad bridge crossing over a river in MT? I found myself stepping out of a river and taking a railroad access down a quarter mile or so to avoid the skeeters in the willows. When I got to the slough again there were "private property" and "no fishing and hunting" signs posted along with hung on barbed wire and connected to the bridge. Respecting the property rights and not wishing for a confrontation, I turned back. I have yet to catch a fish while standing on a railroad tie.