Frisco had a passenger model FP7 San Francisco Railway (Frisco) #'s 5040-5051 Qty: 12 1950-1951 I have not found any record of Frisco buying FP7B; Very few railroads did. Info from; https://www.american-rails.com/emd-fp7.html Since the FP7 already housed all of the components needed for passenger service. The FP7's sales numbers appear very low; only 324 were produced by the time production ended on the model in late 1953. However, the FP7 solved a specific and very important need for railroads operating passenger trains in mountainous terrain. Looking at the locomotive from this angle it was actually a resounding success. The FP7 began production in the early summer of 1949 as a means for railroads to have a streamlined diesel pull passenger trains over stiff grades, a task for which Es were not well suited given their A1A-A1A truck setup that provided relatively poor tractive effort. Realizing this problem and railroads' desire to use the four-axled freight model in passenger operations EMD cataloged the FP7. The locomotive was 54-feet in length (four feet longer than the standard 50-foot carbody of standard Fs) thus enabling the engine compartment to hold both the needed water and generator. Aside from these added components the FP7 was near identical to the F7. It featured GM's 16-cylinder model 567B prime mover that could produce 1,500 horsepower and carried the company's D27C traction motors which offered 40,000 pounds of continuous tractive effort (and a mighty 64,000 pounds starting, then the most of any F available in EMD's catalog). It did, however, use a slightly upgraded main generator, the model D12D and featured dynamic braking a staple of Fs (multiple-unit control as also included). FP7 technical data: http://www.thedieselshop.us/Data EMD FP7.HTML This sound that it was pretty neat puller.