Category:Articles using Template:Track gauge with unrecognized input

This category is populated when unknown or invalid values are entered into track gauge.

Track gauges are predefined list of track gauges. A gauge is a length, written as number + units (mm or ft,in) or is a common name such as "Russian gauge".

Examples:
 * ❌  &rarr; 1669 mm (not predefined: 'unknown')
 * ❌  &rarr; 19 3/4 in (not predefined: 'unknown')
 * ❌  &rarr; 1668 (unit missing)
 * ✅  &rarr;