Above: This well-restored 1939 Caterpillar D-8 is owned by Yarnell Wastler, Frederick, Md. (shown here with his stepson, Luke Warfield). “There was not a lot of yellow paint on it when I bought it,” he says wryly. Restoration work included overhaul of the big engine and pony motor, and rebuilding the pump and injectors. The 135-hp D-8 takes Yarnell back to his youth. “When I was 16, I ran one to clear a horse ring in the mountains, and I thought it was the biggest thing on earth,” he says. “It was big and lazy and clumsy but it was the biggest thing available then. They called them slide bar 8s. Cat offered one with a pulley on the back (to pull a sawmill), but it’s rare to find that, so I put a pulley on mine.” The model was produced from 1935 to the early 1940s. Caterpillar was the featured line at this year’s Tuckahoe show.