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An escalator is a mechanical transportation device that moves people between different floors or levels of a building. It consists of a continuously moving belt of steps that are powered by electric motors. The escalator operates like an elevator but differs in that it doesn't require a lift shaft and moves in a continuous loop. Escalators are commonly found in places with heavy foot traffic, such as shopping malls, airports, transit stations, and department stores. They provide an efficient and quick method for transporting people between floors, especially in large buildings or areas where space is limited. The basic working mechanism of an escalator involves a system of steps mounted on two parallel tracks. The steps are part of a looped chain system that continuously moves in one direction, either up or down, depending on the design of the escalator. The movement of these steps is powered by electric motors located ________ _______ __________ _________ _________ ______.
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