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Detector Rail

A detector rail is a rail-mounted sensor: it outputs strong power 15 while any minecart sits on it, powering the block below and nearby dust until the cart rolls off.

Bedrock Edition · Block dictionary

Detector Rail — spec
OutputPower level 15 while a minecart is on it
Power typeStrong to the block below, weak to adjacent dust
Works withAll minecart types
ComparatorReads a container minecart's fill level (0–15)
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