Standard Gauge refers to the most widely used railway track gauge, measuring 1,435 millimeters (4 feet 8.5 inches) between the rails. This gauge is prevalent in many countries, facilitating interoperability between different railway systems and promoting efficient transportation of goods and passengers. The adoption of Standard Gauge began in the 19th century, primarily due to its balance of stability and speed. It has become the benchmark for many rail networks, including those in the United States, Europe, and Australia, allowing for easier connections and the movement of trains across various regions.