I'm not going into the technical details but from a passenger point of view there are two key issues
Any station north of the Boyne is going to have limited service owing to the single track over the viaduct
If the station is off the mainline it can't be served by any commuter train to Dundalk making it impossible to travel Drogheda north to Dunleer/Dundalk directly which is important given the NSS grouping
The entire viaduct was built for two tracks, the original iron centre span is still in place. They built the new span inside the original they depend on each other.
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