R30045 Hornby Colas Rail, Class 47, Co-Co, 47749 'City of Truro' - Era 11R30045 Hornby Colas Rail, Class 47, Co Co, 47749 'City of Truro' Era 11 Built between 1962 and 1968, the Class 47 Co Co Diesel Electric locomotive was once the most numerous class of mainline diesel in Britain with 512 examples. 310 locomotives were constructed by Brush in Loughborough, and the remaining 202 at Crewe. The locomotives were used for passenger and freight operations. In 2020, 24 of the class remain operational on the national network