Normal gauge refers to the standard measurement used in particular fields such as railways and pipes. Synonyms for normal gauge include standard gauge, regular gauge, or conventional gauge. These terms all refer to the standard size or diameter that is expected for a particular item. For example, a railway track with a normal gauge would typically have a 1435mm width between the rails. In contrast, a narrow gauge track would have a smaller distance, whereas a broad gauge track would have a wider distance. Similarly, in pipes and conduits, a normal gauge would refer to the standard size or diameter that is used in the industry.