This book presents a listing of two hundred and sixty seven engines delivered to twenty-six American railroads by Ross Winans (1796-1877) of Baltimore, Maryland, during the period 1843 through 1863. It is partially derived from a transcription of his Memorandum of Engines from his personal pocket notebook, in the possession of the Maryland Historical Society, Baltimore.1 The material here supplements, corrects, and updates previously published rosters of the output of Winans’ deliveries. It is not necessarily a complete, definitive, nor comprehensive roster of the output of Winans’ shops. It should be noted that not all of the delivered engines were accepted, and that in some cases, the engines were returned and sold to other roads. Thus, there is some duplication in the list which we attempted to resolve by cross-checking rosters and primary source