Irish enterprise north is the route from belfast to dundalk set in the period 1998 1999 the route is set in the time following the upgrading to 90mph operation with welded rails colour light signalling and central train control this route sees the widest range of operations and rolling stock is double track relatively high speed and varied in scenic attraction to the north of the route a relatively intensive local service formed of diesel electric units runs from lisburn to belfast a da