Cogwheel railways are a type of railway system that uses a cogwheel mechanism to help trains climb steep gradients. These railways are designed with a toothed rack rail, which allows a cogwheel on the train to engage with it, providing extra traction. This makes it possible for trains to travel on steep slopes that would be difficult or impossible for traditional rail systems. Typically found in mountainous regions, cogwheel railways are often used for tourism and scenic routes, offering passengers breathtaking views. Famous examples include the Rigi Railway in Switzerland and the Mount Washington Cog Railway in the United States. These railways are an engineering marvel, showcasing innovative solutions for challenging terrains.