the.com/railcar

A box on wheels that lets steel float on steel and somehow saves the planet a little.

means A single self-contained vehicle built to run on rails, whether coupled into a train or working alone.

from A plain 19th-century compound: 'rail' (the iron or steel track) plus 'car,' itself from Latin 'carrus' — a wheeled vehicle, via Old North French 'carre.' As railways spread, English simply welded the two everyday words together to name the thing riding the rails, no myth required.

friction advantage
steel wheel on steel rail beats rubber on road
capacity
one can replace roughly four semi trucks
lifespan
often runs 40-plus years before retirement
quiet owners
most are leased, not owned, by railroads
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