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This study summarizes the work that has been done on the linear engine since it's invention. It attempts to highlight some of the major technologies, designs, and old and recent developments in the long history of the linear engine. In this paper, linear engines are grouped and studied from different standpoints such as internal or external combustion, 2-stroke vs. 4-stroke, number and arrangement of pistons, fuel type, the type of the machine the linear engine drives, depth of investigation, and the complexity of modeling the linear engine. This paper concludes that although simulation of the linear engine has been done with varying complexity and accuracy by several research groups and prototypes have run showing experimental results that predict higher efficiency for the linear engine than that of conventional engines, much work has to be done before the linear engine becomes commercially available.