I happened upon this one near Ardrossan, Alberta east of Edmonton.
There were more than 80 machines entered, some dating back more than 90 years.

The object of the exercise is to attempt to pull the sled the full length of the track...250 feet.

As the pull begins, the weight moves forward on the sled making it increasingly harder to pull.



At Darwell, Alberta every summer they have a tractor pull with the big modified machines pulling, some outputting several thousand horsepower:

View the videos on YouTube of these machines in action:

The Stinger: https://www.youtube.com/watch?v=dpxEwShrZok

The Sorcerer: https://www.youtube.com/watch?v=IS9iHpOkQ80

The Bounty Hunter: https://www.youtube.com/watch?v=w4iKLXwbuOc