An eminent early preservationist, John Crawley was able to amass an enviable photographic archive of steam traction engines and road rollers in their working days, of which this Aveling & Porter selection formed just a part. Organiser of over eighty steam rallies, John saved up to thirty steam traction engines for preservation from the mid-1950s to the early 1960s, at a time when they were considered not much more than worthless scrap. Indeed he became the first owner of no fewer than twenty-two of them. Utilising this incredible and unique collection of images, most of which are previously unpublished, Colin Tyson tells the story of this important manufacturer and iconic British brand.