More formally known as the London Brighton & South Coast (LB&SCR) A1 Class this locomotive became affectionately known as the Terrier due to the distinct bark of the exhaust. The class as designed by William Stroudley and 50 were built between 1872 and 1880 at the Brighton Works in Sussex. The original workings of the locomotive on the main London Lines of the class were eventually displaced by newer and more powerful locomotives and by the LB&SCR electrification scheme. Some of the locomotives were sold to other operators but most were used for Branch line work and non revenue generating operations such as shunting. In this role the class continued in service until the 1960 s with the final active locomotive being decommissioned on the Hayling Island Line in Hampshire on November 1963. In all 10 Terriers survive into preservation. The Dapol O gauge model is based on an in-depth laser scan of W8 Freshwater at the Isle of Wight Steam Railway.