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Main topics are the development and the build-up of an 18ton hybrid truck with a parallel hybrid drivetrain. With this truck it is possible to drive up to 3 kilometers in the pure electric driving mode. In this R&D Project the Engineering Center Steyr, a company of MAGNA Powertain has developed a hybrid truck with an integrated motor generator (IMG) including a clutch system for pure electric driving. Also a Li-Ion power battery, electrified traction voltage auxiliaries (steering pump, air compressor and climate compressor) and a cooling system for the new power electric components. The beginning of the paper shows a detailed layout of the developed hybrid truck. Chapter two shows the developed simulation model which is used for the dimensioning and for detailed simulations of hybrid drivetrains. To simulate thermal effects, a co-simulation environment between a longitudinal dynamics and thermal management software is applied.