Dead Slugs on the Tracks:
Weeks after the power outage, JR Kyushu said they had found the culprit – a slug, which had made its way into an electrical power device installed near rail tracks. “We tracked down the device responsible for the power failure… We initially thought what’s in there was a bug but it turned out to be a dead slug,” a company spokesman told AFP. Local media said the slug had been burned to death after short-circuiting the device.
https://www.theguardian.com/world/2019/jun/24/dead-slug-blamed-for-power-failure-on-japanese-railway-system