Kilmacthomas was an important station on the Waterford to Dungarvan line, which ran ultimately to Mallow. Opened in 1878 by the Waterford Dungarvan & Lismore Railway, it was taken over by the GSWR, becoming the main Cork-Rosslare line. Unfortunately the Waterford-Mallow closed in 1967, however, Ballinacourty magnesite plant opened in Dungarvan and this kept the line from there to Waterford in use for freight until 1982. The weed sprayer was the only train to traverse the line during the 1980s(1988). The last train to run of the line was 141 Class loco 146, which was followed by an inspection car EM50 in May 1990. Kilmacthomas Station is now derelict, but the station building and signal cabin remain. The station was a blockpost with passing loop until the line was lifted in the late 1990s.