There are two locations along the route where an alternative option for MetroLink is under consideration. The first of these is between Fosterstown Station and Estuary Station and the second is between Northwood Station and Airport Station. As an alternative to the current route between Fosterstown and Estuary Stations, which runs on an elevated structure along the central median of the R132, further consideration is being given to running the majority of the route at surface level along the central median of the R132, with grade separation at Estuary, Seatown, Malahide and Pinnock Hill roundabouts. As an alternative to the current route between Northwood and Airport Stations, which runs in tunnel beneath the M50, further consideration is being given to a route which emerges from tunnel at Northwood Station, passes over the M50 to the proposed future station at Dardistown and re-enters the tunnel immediately south of old airport road.
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