in the A1 and AA. It produced at 3,000 rpm. A single solid axle housing with 2 single wheels was used at the front while a single solid axle housing with 2 pairs of double wheels was used at the rear. DA bus A bus based on the G1 chassis, with a lowered floor. Bus bodies were built by several manufacturers; one manufacturer's body seated 21 passengers. (The DA bus should not be confused with the much later DA truck line introduced in the later 1950s.) Dates and Production Figures The DA bus was introduced in January 1936 and was discontinued in September 1940. Mechanicals Similar to the G1. GA A minor update to the G1. Dates and Production Figures The GA replaced the G1 in September 1936 and was discontinued in September 1940. Mechanicals Similar to the G1. GY A version of the GA with the wheelbase shortened to . Dates The GY was introduced in May 1937 and was discontinued in November 1940. Mechanicals Similar to the GA. GB Improved version of the GA, introduced in December 1938, with a redesigned front end, greater length, a slightly longer wheelbase of , and a new Type B engine, a more powerful version of the Type A engine with a higher compression ratio. In January 1940 the engine was further upgraded to and the chassis was refined. Dates and Production Figures Production was 19,870 units between December 1938 and April 1942. Mechanicals Similar to the GA, except for the changes mentioned above. DB bus A bus based on the GB chassis, otherwise similar to the previous DA bus. (This DB bus should not be confused with Toyota's much later DB line of diesel buses introduced in the later 1950s.) Dates and Production Figures The DB bus was introduced in June 1939 and was discontinued in September 1941. Mechanicals Similar to the GB. HB A version of the GB with the wheelbase shortened to . A bus was also built on this chassis. Dates The HB was introduced in November 1939 and was discontinued in May 1941. Mechanicals Similar to the GB. KB Introduced in March 1942, the KB was the replacement for the GB. Designed to meet the military's demand for heavier trucks, its payload was increased to four tons, and its wheelbase was extended to . The body was still made from steel but was of a simpler design