All Models from TR2 to TR6. For years, Bill Piggotts books Original Triumph TR2/3/3A and Original Triumph TR4/4A/5/6 have been the ultimate source of information for all things TR. Here they are combined in one volume incorporating revisions and amendments throughout. The book provides a comprehensive guide to original factory specifications, equipment, colour schemes and options for all models from TR2 to TR6, also revealing how the various models changed through the course of production.