Rack railway, also known as cog railway or mountain railway, refers to a type of railway that uses a toothed rack rail to provide additional traction for trains travelling up steep hills or slopes. Other synonyms for rack railway include inclined railway, cliff railway, funicular railway, and cable railway. These terms describe railways that operate by using cables or other means to pull trains up steep gradients. Rack railways are commonly used in mountainous regions or hilly terrains where traditional rail routes are either inefficient or impossible. In addition, rack railways provide a thrilling and scenic mode of transportation for tourists and adventurers eager to explore the world's most challenging landscapes.