The GS&WR Class 2 was a lightweight 4-4-0 steam locomotive used by the Great Southern and Western Railway in Ireland in the late 19th and into the 20th Century.Many Irish branch lines, some very long, were lightly laid and needed special locomotives to work the trains. With a locomotive weight just of 34 1⁄2 long tons (35.1 t; 38.6 short tons), one of the most successful examples of this type was the GS&WR Class 2.