truck. For 1963, International introduced the heavier-duty Fleetstar, a short-hood conventional slotted between the Loadstar and the heavier-duty R and V-Line conventionals. While no longer serving as a comprehensive model range, the Loadstar shared its cab with the A-series pickup truck (and its derivatives); as a cowled chassis, the Loadstar was produced for bus use (the IHC Schoolmaster). Sharing only its name with its conventional-cab namesake, the Loadstar CO was a low-cab COE (with a forward-tilting cab). In 1965, International introduced the CO-4000, the first heavy-duty COE designed entirely by the company, replacing the DCO-400 "Emeryville" COE (which sourced its cab design from Diamond T). In a design feature that would be adopted by International COEs into the 1990s, the cab was designed with a large trapezoidal grille. In 1968, International redesigned the Fleetstar, adopting the cab of the Light Line pickups. Renamed the Fleetstar-A, the redesign marked the consolidation of the Fleetstar with the previous R-line and V-line trucks. The largest R-210 and R-230 remained (dropping their R prefix) alongside the newly introduced M-series as the largest International trucks, sharing a common cab (dating back to 1952). The Transtar name made its first appearance, as the CO-4000 was replaced by the Transtar CO4070/4090; while visually similar to its predecessor, the Transtar CO was designed with an all-new cab (to accommodate larger diesel engines). For 1969, International introduced the final version of the Emeryville model line, with the DC-400 Transtar 400 replacing the D-400. 1970s In 1970, International split the CO Loadstar into its own product line, dubbed the Cargostar. As part of a model update, the Cargostar received a larger grille and wider cab over its predecessor. Competing directly against the Ford C-Series, the Cargostar was a medium-duty truck fitted with both gasoline and diesel engines (shared with the Loadstar conventional). 1971 marked the end of the "Emeryville" product lines, as the DC-400 Transtar 400 was replaced by the Transtar 4200/4300. Developed as a Class 8 highway tractor, the Transtar 4200/4300 introduced an all-new cab that would be used for International heavy-duty trucks through 1999. Competing against a wide range of manufacturers, the Transtar conventional was offered in both short and long-hood configurations for both regional and long-distance shipping. In 1972, the Paystar 5000 series was introduced, replacing the 210/230 and M-series trucks (dating to 1952). Developed for severe-service use (primarily construction and related applications), the Paystar shared its