Thanks for the info as it’s good to explore options. I have an Athearn BB U33B that I intend to spruce up, mechanically for DCC and externally. I’ve been leaning towards going with a repowering kit from NWSL. Regardless of the route I take, it’s definitely getting DCC-Sound installed.
My friend and forum member, CMarchan, peformed an outstanding upgrade to one of these units. He posted a thread on it just a few years ago:
http://cs.trains.com/mrr/f/88/t/161905.aspx?sort=ASC&pi314=1