This volume offers a fascinating & complex locomotive history, involving 8 major classes, all with common threads & a host of variations, out of which was born Churchward's great locomotive programme which stood the test of time until the end of steam more than 60 years later. G J Churchward was Chief Works Manager at GWR's Swindon Works. This volume in 'David & Charles Locomotive Monographs' Series is written by O S Knock, the famous railway historian & writer.