The Toyota Dyna is a light to medium-duty cab over truck for commercial use. In the Japanese market, the Dyna is sold alongside its twin called the Toyoace. The Toyoace was a renaming of the Toyopet SKB Truck as a result of a 1956 public competition with 200,000 entries. "Dyna" is short for dynamic. The Dyna was originally available in Japan only at Toyota Diesel Store locations, then later available at Toyota Store locations, while the Toyoace twin was available at Toyopet Store locations. The Dyna was also sold as the Daihatsu Delta and the Hino Dutro. In Japan, its traditional competitors are the Isuzu Elf, the Mitsubishi Fuso Canter and the Nissan Atlas. The former Central Motors produced the Dyna Route Van from April 1957 to June 1967. History RK52 The Toyopet Route Truck RK52 was the contributing platform of the Dyna. A new Toyota Japanese dealership was established to sell the Toyopet Toyoace series SKB called Toyopet Store, which also introduced a sedan version of this platform called the Toyopet Master. RK60 – RK80 Second generation of Toyopet Route Truck, Designed by Kanto Auto Works, Ltd. The frame was shared with the Toyopet Masterline RK23 pickup truck and the Toyota Stout. The Toyopet Route Truck was renamed as the Toyota Dyna in April 1959. Although it shared the same platform as the Toyoace, its appearance is more similar to its other derivative, the Daihatsu Delta.The K20 Series Toyoace was produced until the Y10 Series arrived. It was sold as Toyota PK25 Truck for the export market. K170 (1963–1968) The original semi-cab over Dyna was replaced by the new model K170 series in September 1963, with a leaner design with quadruple headlights. The Dyna RK170 also provided the basis for the RK170B Toyota Light Bus, and was built on the chassis of the Stout. It also had the Stout's 1.9-litre 3R-B engine. The Isuzu Elf was introduced in a diesel version in 1960, a version which proved successful enough to relegate the Dyna to second place in sales. Even the new Dyna didn't restore the Dyna's lead, until in March 1964 the J-engined (2,336 cc, OHV) diesel-engined JK170 was added to the lineup. A long wheelbase 2.5 ton version with twinned rear wheels was also available (RK175), as was a route van (glazed minivan) version. U10 (1968–1977) The Dyna platform was changed to the Toyota "U" platform after the