Locomotive jacks.
Fullsize image: https://s3-us-west-1.amazonaws.com/h...s_fullsize.jpg
Previously:
Formula One jack - GIF and photo
Many people jacking up a building - GIF
Exhaust jack - GIF
Jacking up a vessel - GIF
Felling a tree with a jack - GIF
Jacking up a truck on a lift fail - GIF
Dangerous car jacking with lumber - photo
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