# gaugevalue

The distance between the inside faces of the individual rails.

<table><thead><tr><th width="324.5">Label</th><th>Definition</th></tr></thead><tbody><tr><td>Broad</td><td>A set of metal tracks that are greater than 1,435 mm apart.</td></tr><tr><td>Monorail</td><td>A single rail serving as a track for a wheeled vehicle.</td></tr><tr><td>Narrow</td><td>A set of metal tracks that are closer together than 1,435 mm.</td></tr><tr><td>Standard</td><td>A set of metal tracks that are 1,435 mm apart.</td></tr></tbody></table>