http://www.openstreetmap.org/?lat=53...om=16&layers=M
http://www.bing.com/maps/?v=2&cp=sx5...21&lvl=1&sty=b - these images are of various dates, so if you move about, you see different stages of construction.
http://maps.osi.ie/publicviewer/#V1,701723,743812,6 - access is off the medium sized roundabout to the west of the motorway interchange. If you look at the historic layer, you can see the original railway.
Meath County Council are meant to be working with Irish Rail in improving pedestrian access.