The tracks are wrapped around one or more drive wheels, often cogged, which directly pull on the track. On the bottom of the vehicle are the road wheels, which ride on top of the track where it ...
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Smithsonian Magazine on MSNThese Tracks Reveal Evidence of 22,000-Year-Old Wheelbarrows—But Without the WheelsThe drag marks and footprints were discovered in present-day New Mexico. Researchers say they're some of the earliest known ...
“And just because the excavators have wheels, doesn’t mean they have to ... In regards to a majority of tracks in construction equipment undercarriages, Andrews believes that North American ...
Scientists discovered 22,000-year-old tracks in New Mexico, possibly the oldest evidence of human transportation using a travois.
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