The Lanz Bulldog D9511 is a standard-tread tractor produced by Lanz from 1935 to 1955 in Mannheim, Baden-Württemberg, Germany. It belongs to the D95 Series and is a combination model designed for both road and field use, featuring front-axle springs. The tractor is powered by a 10.3L 1-cylinder liquid-cooled diesel engine producing 44.1 hp at 630 RPM. It has a 6-speed gear transmission and two-wheel drive.