Ran across this in doing some reach. Thought it was interesting especially that I was not aware there was a FL9A with six wheel trucks.
EMD F9 Operating Manual 1957
GENERAL DATA (Cont'd)
Minimum Curve Radius (F9 and FP9).......... 250'
Minimum Curve Radius (FL-9)...................... 274’
Center of Gravity Above Rail (approx.) ........ 63"
Overall Length Over Coupler
F9A Unit ....... 50' 8”
FL9A Unit...... 58' 0”
FP9A Unit ...... 54' 8"
F9B Unit ...... 50' 0”
Maximum Height Above Rail ................. 15' 0”
Maximum Width Over Handholds.............. 10' 8”
GENERAL DESCRIPTION DESCRIPTION A description and general location of equipment on F9 (Fig. 1-1), FP9 and FL9 locomotives is given in this section. A locomotive consists of one or more units rated at 1750 horsepower per unit. Those units equipped with an operating cab are designated "A" units, and those without cabs as "B" or Booster units. Depending upon the horsepower requirements a locomotive will consist of from 1 to 4 units. The FP9 and FL9 locomotives are only built as "A" units and are exactly comparable to the F9 "A" units except that the FP9 is 4 feet longer than the F9 and the FL9 is 4 feet longer than the FP9, to provide space for additional features or equipment. The FL9 also differs from the F9 and FP9 in that it is equipped with a six wheel #2 truck.