Following the sucess of the Beyer Peacocks 2-4-0T design and in the effort to replace older 2-2-2T engines on the Dublin suburban services. The Dublin, Wicklow and Wexford Railway built the XVI Class at Grand Canal Street Works between 1885-1897. A total of 12 engines were built, making it the largest class of the DWWR. The first 8 engines had round cabs and bell mouthed domes whereas the last 4 had square cabs and round top domes. Some engines were given names, but the tradition was being questioned and some engines received no names while some engines had names allocated but never given such as 6, Greystones and 7, Foxrock. Between 1900 and 1911, five engines were completely rebuilt as 2-4-2T engines, later known as the Saint Class or the XXI Class. At roughly the same time between 1909 and 1911, three engines and 1 more in 1921 were simiarly rebuilt but remained as 2-4-0T engines with new cabs, tanks and boilers. The two remaining original engines were scrapped on entering the GSR in 1925. During the GSR and CIE, the then G1 Class engines continued working on the Kingstown Boat Trains onto Carlisle Pier, notably pulling +200 ton trains where on one occasion, No.424 pulled 6 bogie coaches and seven six-wheeler coaches while only being 30s late. They were withdrawn in the early 50s. Includes AJS Script.