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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:

Here is an example

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    @PhilipKendall my English is not so fine and I'd like to receive any suggestions to make the questions more understandable – Ale Jan 30 '17 at 14:58
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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.

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