The series of order books contain details concerning the company’s orders; this includes orders for engines, tenders, duplicates, extras and duplicates. Also included are orders for machine tools although there is also a separate run of machine tool order books. Information recorded includes the following: name of ordering company, description of the order, and the stock number given to the order. There then follows any instructions relating to the order and a list of drawings used in the design and construction of the order.