Carlingford is located on the former Dundalk Newry & Greenore Railway, which ran from Newry down along the Carlingford Lough to Greenore port. The line was later bought by the infamous London & North Western Railway (LNWR) and from then on the line had an LNWR influence which lasted right up to 1951 when the line closed. The trains used LNWR liveried coaches and locos even after the line had been taken over by the GNR(I) in the 1930s, after the LMS withdrew interest in the rail line.

Carlingford station building still stands at the south end of the town on the principal road , which has been built and widened on the former trackbed of the rail line. The station building is currently been used as a Tourist Information centre.