standard gaugestandard gauge
- a width of 56.5 in (143.5 cm) between the rails of a railroad track, established as standard
- a railroad having such a gauge
- a locomotive or car for tracks of such a gauge
- A standardized distance of 56.5 inches (143.5 centimeters) between the rails of a railroad track.
- A locomotive, car, or railway line of this gauge.