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This horrific weapon was found during railway station searches this morning.
The blade, with a serrated edge, was seized in an operation to combat knife crime in Dover.
The knife was found in a joint operation between British Transport Police, Kent Police and Southeastern at Dover Priory Station.
A tweet from BTP said: "We have been working with Kent Police and Southeastern this morning at Dover station on an operation to combat knife crime.
"This resulted in below knife being seized and a person arrested for carrying it."
Kent Police explained that officers had used a a metal-detecting walk-through arch and carried out a stop and search when the blade was detected.