Alcoholic beverages will not be permitted on any train to and from New York or Hoboken on Saturday.
NJ Transit police arrested 16 people during St. Patrick's Day last year, including two people who were charged with aggravated assault on two conductors. Most of the arrests were for disorderly conduct.
Additional train service will be available on the Northeast Corridor, North Jersey Coast, Morris & Essex and Port Jervis lines on Saturday for the parade.
There also will be extra bus trips.