I was out and about today taking photographs for the Gazetteer (small number of short lived stations sites on the line between Howth and Drogheda via Howth Junction).
I finished up in Drogheda, taking a photograph of the approach to the original D&DR station in Drogheda, which was to the east of the present station and the site of which is now occupied by the Drogheda Traincare Depot.
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Looking at the photos I took and at the track layout on openstreetmap.org, there is effectively only one access point to the depot (technically there are two but they are side by side). This is not best engineering practice as if a train were to fail along the section of track covering the two access points, the depot (and potentially all trains therein) are stranded in the depot.
This is not an unrealistic prospect as this did happen in the Traincare Depot in Portlaoise.