How are the parallel tracks created for cross country skiing competitions? The tracks seem almost perfectly parallel and maintain a perfect shape even after the passage of many skiers - for example:
As you’ve indicated, the tracks are typically perfect. That’s because they are made with snow grooming equipment similar to the Trakor. It’s a device that is towed behind a snow machine or other vehicle while grooming the snow. While it’s not terrible high tech, it lays a perfectly groomed track with the ability to adjust the trail widths.