the new Tourismo are the new engine output available (354 hp/408 hp/428 hp) and the new-generation transmissions available with EPS system. Currently Mercedes-Benz concentrates the integral bus production in Germany and Turkey, and chassis production in Spain and Brazil. There are other manufacturing basis around the world, such as the ones in France and Argentina. Polomex A joint-venture between Mercedes-Benz and Brazilian coachbuilder Marcopolo resulted in the formation of Polomex. The company assembles and sells urban buses and coaches with Mercedes-Benz chassis and Marcopolo body in Mexico. The coach range includes the Multego, a luxury coach based on the Mercedes-Benz OC500 modular bus chassis. The body, produced by Marcopolo, features a design similar to that of Mercedes-Benz Travego. Alternative drive The earliest cited alternative-drive bus sold by Mercedes-Benz is the O6600 T, a trolleybus based on the O6600 H diesel bus. In the early 1950s, 350 German-made Mercedes-Benz trolleybuses were exported to Argentina. Nonetheless, Mercedes-Benz engaged in intensive research and development of alternative propulsion systems in the 1960s. In 1969 the brand presented the OE302 electric bus. Two years later, a natural-gas-fuelled version of the O305 was unveiled, and in 1975 the OE302 duo bus went into trial operation in Esslingen, Germany. A minibus operated on pure hydrogen was demonstrated in 1977. In 1978 the hybrid electric OE305 was presented. The same year Mercedes-Benz do Brasil presented the OF-1315 front engine natural-gas-fuelled bus chassis for the Brazilian market. Other five duo buses went into trial operation in Esslingen the following year, two of them in battery/trolley operation and the other three in diesel/trolley operation. Also in 1979, Daimler-Benz sent a German-built O305 trolleybus to be tested on the São Paulo trolleybus system, Brazil, then one of the most extensive trolleybus systems in the western world. The O305 GT trolleybus would go into production in 1981. Also in 1981 a methanol-fuelled O305 was unveiled. In 1983 methanol-drive Mercedes-Benz buses were tested in São Paulo, Brazil. Some time later, 40 natural-gas-fuelled Mercedes-Benz O364 rear-engine integral buses went into experimental operation in that city. Two of them used a mixture of soy oil, ethanol and B-Diesel as fuel. In the following year Mercedes-Benz do Brasil unveil the OH-1315, a natural-gas-fuelled rear-engine bus chassis, and the O371 integral bus range for the Brazilian market, including a natural-gas integral urban bus and a trolleybus. In 1986 experiments were made in Europe with an articulated duo