The Rigid-Rail 25-40 was offered in 1921 and 1922. It had two crawler tracks in the rear and one front steering wheel. The curved arm over the front wheel indicated its position to the operator. Stearns provided the Model BU, a 5 x 6 1/2 inch four-cylinder engine, complemented by a Berling magneto and Tucker carburetor. Three forward speeds and one reverse were available in the sliding gear transmission.