The overload.gbx file you have requested: Maps Levels Missions / Tracks / Bay / Overload - 18.33kb is not available. Perhaps try browsing all files for the game TrackMania: Sunrise and upload any files you want to share or are missing. This is the only information we could locate:
For more information on TrackMania Sunrise, visit Trackmania.filefront.com 2 islands, 2 tunnels and lots of speed! First island is full of loops. Second island is the road island and it's full of roads.