For example, if your default rail gauge setting is 1.435 metres, and your lower gauge tolerance is 0.005 metres, tracks that have a rail gauge between 1.430 metres and 1.435 metres would be detected. Any tracks with a rail gauge under 1.430 metres would not be detected.
See also higher gauge tolerance.
A number with a value greater than 0, expressed in metres.
Default Setting: 0.005 metres
Changing properties: If you wish to change the option of this property, your Project Settings Administrator must request a project settings change.