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The arrest was made as part of Operation Twin Tracks.
A person has been arrested on-board a train in the midlands.
They were discovered to be misusing drugs on the rail-line during a patrol by Portlaoise Community Gardaí.
The arrest was made as part of Operation Twin Tracks, which aims to eliminate anti-social behaviour on-board trains and at stations around the country.
They are due to appear before the courts at a later date.