Couple of reasons -
1. Line via Slane only signalled for freight at the moment.
2. If it were upgraded, there would be a cumbersome double reverse at Drogheda, since the Slane track splits off before the platform, unless all Slane trains bypassed Drogheda Station. Check out pictures at Eiretrains.
That said, hopefully the Navan via Clonsilla track will not lead to the closure of Navan-Slane-Drogheda, never know when it might be needed again *cough* Broadmeadow *cough*.
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