I have been listening on and off to this frequency when it is active in my mobile. Pretty good signal. Today I programmed it in scanner in house and its loud and clear. The conversations always refer to "air brakes" and other terms that make me think it is a NATIONAL GRID channel. Did a search and nothing turns up in RI or Bristol County Mass. However I did read an old thread from 2012 and someone said it is National Grid in Attleboro. I think there is another freq. that sounds similar, 471.325. I did search but turned up nothing.