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Mobs were never be able to spawn ON rails, only through rails. This fact is also not mentioned in the original release comment from Mojang. They just talk about a spawning bug related to rail. They were spawning ON the block below the rail using the free space of the rails and an air block above that. (The main spawning test is if a block has a solid top surface.) --81.209.202.2 15:25, 12 November 2015 (UTC)

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