The Carmarthen to Pencader section of the C&CR was now part of the main line to Aberystwyth. Although designated a main line, it was a long and difficult route connecting Carmarthen and Aberystwyth with relatively limited intermediate population centres. In the 1950s holiday trains to the Butlin's Holiday Camp at Pwllheli traversed the route, but in the economic conditions prevailing in the 1960s, it too came under review. The line closed to passengers on 22 February 1965. The main line continued to serve a creamery at Pont Llanio near Llanddewi Brefi, which survived until 1970; milk trains also used the Aberayron branch as far as a creamery at Green Grove near Felin Fach, which remained in service until 1973.