The Great Western Railway (GWR) Ariadne Class and Caliph Class were broad gauge 0-6-0 steam locomotives designed for goods train work by Daniel Gooch and are often referred to as his Standard Goods locomotives.The class was introduced into service between May 1852 and March 1863, and were built in seven lots at Swindon totalling 102 locomotives, and withdrawn between January 1871 and the end of the GWR broad gauge in May 1892.