Horns not to be lubricated

Horns not to be lubricated
Is it just me, or does that sentence read a little phallically? :)

The object in this photo is the end of a train-carriage; the part that hooks on to the next carriage. I wonder if carriage horns should normally be lubricated and if this sign was painted on the horn to indicate to the guys who normally maintain the carriages that this one had been decommissioned and should no longer be lubricated. I'm not sure - do you know?

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