noun
railway gauge; track gauge
Technical term for the distance between the inner sides of the two rails on a railway track.
日本の在来線の軌間は1067ミリメートルです。
The gauge of Japan's conventional railway lines is 1067 millimeters.
新幹線の軌間は標準軌の1435ミリメートルです。
The Shinkansen's track gauge is the standard gauge of 1435 millimeters.