A century ago, steam engines powered the logging industry in Mendocino County, where more than 40 railroads transported logs. While most of those railroads are long gone, the Roots of Motive Power Festival keeps some of the engines alive. At the annual event, steam engines are revved up, ready for visitors to explore and even ride. Besides steam locomotives, a steam shovel, steamrollers, stationary engines, and tractors will be on display, and there will be a demo of old logging equipment, too. The festival runs September 10–11, 10 a.m.–4 p.m., at Roots of Motive Power on Commercial Street in Willits. On September 10 there will be a barbecue, live music, and a silent auction starting at 4:30 p.m. And on September 11, there’ll be a chance to make a linoleum print with a Buffalo Springfield steamroller. A fee will be charged for the barbecue, but the rest of the festival is free. For more information, go to rootsofmotivepower.com and tinyurl.com/2fkyvdjb.