On September 8, 2005, Montana Rail Link took delivery of locomotive number 4300, the first of 16 new EMD SD70ACe locomotives. This is the first locomotive that the railroad has ordered new from a manufacturer, and it and the rest of the class are intended to replace aging SD40 and SD45 class locomotives on trains crossing the Rocky Mountains over the continental divide at Mullan Pass near Helena, Montana and Bozeman Pass near Bozeman, Montana.