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by phkahler
397 days ago
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Imagine one short "train" whose tail is able to pull up one rail of the track behind it. Then another train whose front is an automated thingamajig to take the loose rail and nail it down a specific distance from the fixed rail. How much play there is in the loose rail depends on how far apart these two train are. Notice that the nailer runs on the narrow rails while the nail-puller runs on the wide ones. |
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