Boston & Maine 1732 is a GP-9 1750 hp Diesel road switcher, built by GM’s Electro-Motive Division, May 1957 (#23230). Numbers 1700-1749 were built as “trade-in” locomotives, with B&M sending obsolete 1944-era FT road freight units to EMD for “remanufacture” into these GP-9 units. It was a bookkeeping exercise, as the GP-9 locomotives came right off the EMD production line.