Youtube comments of (@BizarreBeasts).

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  83. Great questions! In the research it sounds like the millipedes swarm together and travel as much as 50 meters to mate and eat before laying eggs and hibernating. It doesn't seem like the tracks are attracting them so much as the tracks just happened to go through places the millipedes already were. Much of the sampling in the paper was taken from swarming densities in the surrounding forests, but the train obstruction helped make this something people were interested in studying (and gave them a lot of data points). And as far as how they obstructed the train, in the LiveScience article about the research says, "Train operators in Japan first observed an outbreak of train millipedes in 1920; they had to briefly stop their train as they waited for the creepy crawlers to pass over the tracks. According to various accounts, the millipedes returned every eight years or so after that, each time forming a dense blanket that was impossible to pass through." The paper has the recorded densities of millipedes in 1984 and the highest was 768 individuals per m^2 on nearby roads. This does make me think that the millipedes were visible on the tracks from far enough away that they were able to stop the train to avoid trying to pass through them, which is a wild thought! So I can't say from the information I have whether a train could have pass through them, but (as a few other commenters have pointed out) there are reports of millipedes derailing trains in other locations! -Sarah https://www.theatlantic.com/technology/archive/2013/09/australia-just-had-a-train-accident-thats-being-blamed-on-millipedes/279380/
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