The Leader 25-40 is an agricultural crawler tractor produced from 1916 to 1920 by Leader, a part of Dayton-Dick, built in Quincy, Illinois, USA. It features a 13.0L 4-cylinder kerosene engine with a Kingston-Bennett carburetor, rated at 750 RPM, and a 2-speed gear transmission with 2 forward and 1 reverse gears. The tractor has a half-track drive with manual steering and an open operator station. It weighs 6000 lbs (2721 kg) and originally sold for $1,550 in 1916.