Functions of mitochondria depends on the cell type in which they are present. The most important function of the mitochondria is to produce energy. The simpler molecules of nutrition are sent to the mitochondria to be processed and to produce charged molecules.
Shanghai Maglev, also known as Shanghai Transrapid, is currently the fastest train in the world. CRH 380A running between Beijing and Shanghai, was manufactured by CSR Qingdao Sifang Locomotive & Rolling Stock. AGV Italo, touted to be the most modern train in Europe, has a maximum operational speed of 360kmph.
Kingda Ka is the fastest roller coaster in the United States. It was the fastest coaster in the world for a few years but has since been eclipsed. (It is still the tallest, however.) It's similar to Top Thrill Dragster (although faster), but it feels rougher. If speed is what you are after, Kingda Ka delivers.