Hi Max
The GPX format allows a Track Name, URL etc to be defined as part of a track, however these are not displaying or working in the WP GPX plugin.
http://www.adventureridingnz.co.nz/gps-tracks-rides/south-island-tracks/
Excerpt from http://www.adventureridingnz.co.nz/wp-content/uploads/gpx/SouthIsland20.gpx
<trk>
<name>Hakataramea Pass</name>
<url>www.adventureridingnz.co.nz/gps-tracks-rides/south-island-tracks/hakataramea-pass</url>
<extensions>
<gpxx:TrackExtension xmlns:gpxx=”http://www.garmin.com/xmlschemas/GpxExtensions/v3″>
<gpxx:DisplayColor>Yellow</gpxx:DisplayColor>
</gpxx:TrackExtension>
</extensions>
Eddie