bus in 1936, virtually all Thomas school bus bodies had been produced in the "conventional" style: a body mated to a cowled truck chassis. While the design was the most popular configuration, the transit-style configuration allowed for a higher passenger capacity (up to 90 passengers). In the early 1970s, Thomas developed the Saf-T-Liner ER (Engine Rear) as an alternative to the Blue Bird All American. In line with other body manufacturers (Carpenter, Superior, Ward, and Wayne), Thomas was dependent on a second-party manufacturer for rear-engine chassis (using Ford, Dodge, GMC, International Harvester and Volvo). In the early 1970s Thomas Built Buses introduced the first of its "Mighty Mite" series of buses and were the smallest conventional bus ever produced by Thomas. Most were built on Dodge D300 chassis but when production of this series ended at the main plant in High Point, NC, production was moved to Hamilton, Ontario and the Canadian built Mighty Mites used modified International Harvester Loadstar chassis. For 1972, the Saf-T-Liner body underwent a major redesign. Along with extending the rub rails completely around the body, the front and rear roof caps were flattened (to accommodate 8-lamp warning systems), and the windshield was enlarged. Following the addition of safety upgrades to comply with safety mandates in 1977, the Saf-T-Liner body saw use in the Conventional through the end of 2006; in modified form, it remains in use with the EFX and HDX (and resized to fit the Minotour). At the smaller end of the size scale, the Saf-T-Liner body was resized to produce the Mighty Mite, a narrow-body school bus on a shorter-wheelbase conventional chassis. In 1978, Thomas made a major change to the production of the Saf-T-Liner ER. Coinciding with a design update, Thomas introduced a company-sourced chassis, along with the front-engine Saf-T-Liner EF. With the introduction of the EF, Thomas became the first school bus manufacturer to produce its own chassis for both front and rear-engine school buses, ahead of Blue Bird by a decade (California manufacturers Crown Coach and Gillig Corporation had not produced a front-engine school bus since before World War II). As a competitor to the Blue Bird Mini Bird and Carpenter Cadet, Thomas reintroduced the Mighty Mite as a Type B bus, a school bus body paired with a stripped chassis. 1980s The late 1970s and early 1980s was a period of struggle for all school bus manufacturers. Coupled with