Comment by sigwinch28 | Hacker News Reader

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Comment by sigwinch28 | Hacker News Reader

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Measurement trains filled with cameras and LIDAR

For example, in the U.K.:

https://en.wikipedia.org/wiki/New_Measurement_Train

https://en.wikipedia.org/wiki/Doctor_Yellow

LIDAR is good, but as another commenter pointed out, Ultrasonic Flaw Detection (USFD) is the gold standard for crack/flaw detection.

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