The accompanying map of the current railway network shows lines that are fully operational (in red), carrying freight only traffic (in black) and with dotted black lines those which have been "mothballed" (i.e. closed to traffic but potentially easy to re-open). Some airports are indicated but none are rail-connected, although Kerry Airport and Belfast City Airport are within walking distance of a railway station. Both the City of Derry Airport and Belfast International (Aldergrove) are near railway lines but not connected. Ports are marked, although few remain rail-connected. Larne Harbour, Belview Port and Rosslare Europort are ports that are still connected.