Narrow gauge rails are a type of railway track that has a smaller distance between the rails compared to standard gauge tracks. Typically, narrow gauge tracks measure less than 1,435 millimeters (4 feet 8.5 inches) apart. This design allows for tighter curves and is often used in mountainous or rugged terrain, making it easier to build railways in challenging landscapes. These railways are commonly found in tourist attractions, mining operations, and heritage railways. They are often more cost-effective to construct and maintain, which is why many smaller or less populated areas utilize narrow gauge systems for transportation and freight services.