In 1925, Baldwin turned out boxcab No. 58501 that can be considered the USA's first diesel locomotive. Its official designation 12-OE-1000/1 CC can be understood as “12 cylinders, oil engine, single 1000 hp engine, wheel arrangement CC”. In fact the middle axle of each bogie was not powered, leading to the A1A-A1A wheel arrangement. Power came from an inverted Knudsen V12 two-stroke diesel that sat between the two cabs. After trials, the locomotive was deemed unsuccessful and scrapped after a short time. 