Frisco mid-1950's Diagrams #9b - EMD F's, B-units

[meteor910]

SLSF 5100-5117, EMD F3B
SLSF 5118-5139, EMD F7B
SLSF 5140-5152, EMD F9B

Attached are the early (1957) diagram sheets for the Frisco EMD F B-units. All came without dynamic brakes until the F9B's were ordered, which were equipped with factory d/b. The first F9B's were built in January, 1954, a month before the two F3A's, SLSF 5005 & 5007, were rebuilt into F9A's. Thus, the first dynamic brakes on the Frisco came with the initial group of F9B's.

Ken

[meteor910]

FYI, a couple of people have asked what the designation F37A and F37B means on the Frisco F3A and/or F3B diagrams above.

Shortly after the arrival of the Frisco F7's, the SLSF operating people realized how much better the F7 was than the F3. The improvements were of about the same magnitude as was the F3 improved over the FT/F2.

The Frisco rebuilt all of their F3A's and F3B's to bring them up to F7 standards. I don't know what all was rebuilt, but it most likely was electrical related. The rebuilt F3A's & F3B's were then designated as F37A's and F37B's by the Frisco. Units SLSF 5005 and 5007 were not rebuilt, as they were in the process of being rebuilt into F9A's by EMD.

Ken