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Ballast Cleaner

• deofoo 3y ago
  There's something beautiful in a train that fix its own tracks.
• ofrzeta 3y ago
  Ballast seems to be HN's new darling :) Recently (282 comments): https://news.ycombinator.com/item?id=36183788 https://news.ycombinator.com/item?id=36183788 The machines are fascinating. Actually some are more like factories on train wheels.