The Irish Examiner (soft paywall) reports that Cork City Councillors have approved Part 8 planning (process for a local authority to grant itself planning permission) for a greenway on part of the former CB&SCR trackbed between the Kinsale Road roundabout and Chetwynd Reservoir (east of the former, the trackbed is now a road).
The map below (extract from Openstreetmap and licensed under the Open Data Commons Open Database License) shows the location, to which I have added a rough line of the route in red.
