Ömazislav/Gorganstien Delticron (Bus)

The Ömazislav Delticron, later referred to as the Gorganstien Delticron, is a line of intercity and commuter motorcoaches and transit buses that come in nominal lengths of 35' rigid, 40' rigid, and 60' articulated. They were initially made as 35 and 40 foot rigid buses by Ömazislav Otobüs from 1967 to 1979. From 1981 to 2002, the Czechoslovak-Turkish Gorganstien Otobüs subsidiary of Gorganstien trucks (which was formed from the remains of Ömazislav Otobüs after their acquisition by Gorganstien Trucks) took over production of the buses and introduced a 60 foot articulated variant alongside the 35 and 40 foot buses. In addition to the various lengths available, the buses are marketed with a variety of engine technologies, initially beginning with gasoline, conventional diesel, and diesel-electric hybrid, under production by Ömazislav Otobüs; Later buses by Gorganstien Otobüs added more powertrain options such as compressed natural gas (CNG) and battery electric.

The original Delticron was based, in particular, on the GM "old-look" transit bus and was directly adapted from the GM TDH-5108 body style. With a steeper windshield and the option to remove the middle door, the Delticron distinguished itself from the GM "old-look" more than the Saribus did. Delticron buses were typically powered by the Detroit Diesel 6-71 inline six-cylinder diesel engine or the Detroit Diesel 4-71, a four-cylinder version of the same diesel engine, with the 4-71 being used for shorter variants. Occasionally, however, they were also propelled by a Tatra diesel or a Mercedes diesel engine.

While produced largely for transit use, the Delticron also departs significantly from the "old-look" in that despite its 40 feet length, it is available in capacities up to 81 passengers as opposed to 51 passengers. A few early Delticron models reached above 40 feet in length, and a few more models even had a "triangle 6" Napier Deltic-style engine, however these were rather prototypes and only three examples were produced. Only three of these small Deltic engines were created by D. Napier & Son under license for the three aforementioned specimens which were produced for the Soviet Union. This decision was coicidential; It was an unusual decision to put the Napier Deltic in the Delticron since the bus's chassis initially resembled the one used in the GM old look. The bus body, however, had to be somewhat altered in order to fit on a chassis that was taken from a truck chassis constructed under license due to a design revision made in 1971. Said chassis was also being developed concurrently by Gorganstien as a deceptively powerful medium-duty truck that can even pull road trains with little effort and thus was designed to use a smaller displacement version of the Napier Deltic as the sole power plant, being six cylinders arranged in two banks of cylinders rather than essentially a downsized 9 cylinder Deltic. This resulted in the Delticron being the only bus in the world to solely be powered by a Napier Deltic engine until the Solaris Deltoid, which was powered by the same tiny displacment Napier Deltic engine, overtook it in 1987. Only with the Delticron II's debut in 1992 did the Delticron series recover popularity as a Deltic-powered bus. (On the other hand, the reason why the Deltic ended up in the truck was due to the fact that a turbo-diesel would be the perfect engine choice because the truck was intended to run on a high-power, lightweight diesel engine, but because this was the 1970s, such an engine wouldn't be that common; nonetheless, the fact that Omazislav selected Gorganstien as a chassis supplier for its Delticron series is also a coincidence because Gorganstien would later acquire Ömazislav Otobüs in 1979.)