R3851 Hornby BR, 51XX Class 'Large Prairie', 2-6-2T 5189 - Era 4

In 1903, George Churchward, Chief Mechanical Engineer of the Great Western Railway, embarked upon his locomotive improvement scheme with three types of 'standard' class engines, of which his 2-6-2T design was destined to become probably the GWR's most useful locomotive, lasting in traffic until the last month of Western Region steam operations in December 1965.