Description With the tightening of environmental emissions legislation for automotive vehicle based transportation systems, hybrid power trains have been adopted as promising power train systems to deliver vehicle functionality while substantively reducing the associated emissions. Hybrid drive trains have been adopted in all sectors of the automotive engineering industry ranging from city-cars, through recreational-vehicles to hyper-cars. This project will undertake a technical examination of the different types of hybrid drive systems which are currently being used and being developed An attempt will then be made to establish which configurations delivers the best reduction in emissions while maintaining vehicle functionality. Finally, the project will investigate future development options which could deliver the ultimate power and emission reduction performance for hybrid drive trains. Key Objectives Understand the operations and limitations of hybrid drive trains identify where and how the performance of these systems can be improves