Explanation: Narrow gauge railways are a specialized type of railway system designed for use in areas with challenging terrain, such as hilly regions. The track gauge of a narrow gauge railway is narrower than the standard gauge, which is typically 1,435 mm (4 feet 8.5 inches). The narrower gauge allows for tighter curves and steeper gradients, making it ideal for navigating the steep and winding paths of mountainous areas.
In West Bengal, the Darjeeling Himalayan Railway is a prime example of a narrow gauge railway. This railway, also known as the "Toy Train," operates on a 2 ft (610 mm) gauge and is a UNESCO World Heritage site. It connects the town of Darjeeling to Siliguri, passing through the scenic Himalayan foothills. The railway is famous for its steep gradients and sharp curves, which are characteristic of narrow gauge railways in hilly regions.
Similarly, the Nilgiri Mountain Railway in Ooty, Tamil Nadu, and the Matheran Hill Railway in Maharashtra are other examples of narrow gauge railways in India. These railways operate on a 2 ft 6 in (762 mm) gauge and are also UNESCO World Heritage sites. They serve the hilly regions of the Nilgiri Hills and the Western Ghats, respectively.
The hilly areas of Darjeeling, Shillong, and Ooty are known for their narrow gauge railways due to the challenging terrain. The steep gradients and sharp curves in these regions make it impractical to use standard gauge railways. Instead, narrow gauge railways are used to provide efficient and safe transportation in these areas.
In contrast, the Northern Plains of India, the deserts of Rajasthan, and the Central Highlands are characterized by flat or relatively flat terrain. These areas do not require the specialized design of narrow gauge railways. Standard gauge railways are more appropriate for these regions, as they can handle the long, straight stretches and flat terrain more efficiently.
In summary, narrow gauge railways are found in hilly areas such as Darjeeling, Shillong, and Ooty due to the challenging terrain that requires specialized railway systems capable of navigating steep gradients and sharp curves. These railways are an essential part of the transportation infrastructure in these regions, providing a unique and scenic mode of travel.