On his day off Red and White Port Engineer Mike Epstein likes to take his nearly three-year-old son Mark down to the Bay and onboard the tour boats that he maintains. On a recent May morning he took a little extra time with his boy to show me around the refurbished and repowered 90x34-foot Royal Prince moored to the company dock at Pier 43 1/2 on the Embarcadero. The deep personal commitment to a greener environment is common in amidst the beauty of the San Francisco Bay Area, but Mike expresses it in a particularly intense fashion when he speaks about the Cummins QSK19 Tier 2 engines that they have recently installed in this practical craft. Asked what thinking went in to the engine selection, he replied, ?Not much thought was needed.