BBC News By Alan Haslam image captionNature reclaims the overgrown Lissummon Tunnel There was a time when almost everyone in Northern Ireland lived within five miles of a railway station. More than 750 miles of track once linked towns and communities in every county, but most of this infrastructure was abandoned in the 1950s. A new review into an all-Ireland rail network was announced in April to look at the possibility of reviving the golden age of rail travel. But why did Northern Ireland's rail network disappear in the first place? image copyrightDownpatrick & County Down Railway Archive image captionThe creation of a border led to huge delays for passenger trains