I have created a map of where I think the Navan Rail Line should go!
I cannot understand why the planners insist on passing to the west of Dunshaughlin when if they go to the east they can pick up additional passengers from Ratoath / Ashbourne thus increasing revenue/viability.
Also an easterly approach to Navan will allow them to use the existing Boyne bridge viaduct, and give access to a central station there.
See my map here.
http://maps.google.com/maps/ms?ie=UTF8&hl=en&msa=0&ll=53.547652,-6.459274&spn=0.390839,0.837021&z=11