The North Wales Coast Line is the main rail line serving North Wales. It branches off the West Coast Main Line (line from London Euston to Glasgow Central) at Crewe, proceeding west via stations such as: Chester, Shotton "(low level)", Prestatyn, Rhyl, Colwyn Bay, Llandudno Junction, Bangor and Holyhead, connecting with Irish Ferries and Stena Line ferry services to Dublin Port in the Republic of Ireland. The majority of services on this line are operated by Transport for Wales, with services between Holyhead, and London Euston (via the West Coast Main Line) operated by Avanti West Coast. The busiest station in 2017-18 on the line was Bangor, with Rhyl second, and the least busy being Tŷ Croes, with the least busy non-request stop being Abergele & Pensarn.