Most readers know by now that I am one of a group of columnists who, in rotation, write the “Getting Real” column about prototype modeling in the on-line magazine, Model Railroad Hobbyist, or MRH. My most recent column has just appeared in the November issue. In recent years, MRH has been published in two parts: one that remains free to read on-line or download (visit www.mrhmag.com ) and in a second section, called “Running Extra,” which carries a fee, either for single issues or via subscription (cheaper per issue). The “Getting Real” columns have been appearing in “Running Extra.”
My new column is about modeling Southern Pacific flat cars. The idea to do that was stimulated by a question I was asked recently about the SP fleet of such cars, but also has a background in a talk I used to give some years ago, entitled “SP cars you can model,” emphasizing commercial models of the most common SP freight cars. Maybe that talk should be updated and revived. But that’s another story.
(For a full background on SP flat car history, my source is my book, Volume 3 in the series, Southern Pacific Freight Cars, Signature Press, 2004, covering automobile cars and flat cars.)
In the column, I began at the turn of the 20th century, with the first fully standard SP flat cars with steel underframes in any numbers, and the first to carry Harriman-standard class numbers, classes F-50-1, -2, and -3. The “F” stands for flat car, the “50” means 50-ton nominal capacity, and the last number is the individual class. Since those earliest cars were mostly gone from the fleet by the year I model, 1953, I have not modeled one.
But following those cars, SP adopted a flat car design that would be followed, with only minor changes, for over 20 more years and a dozen more flat car classes. This design originated in the Harriman era and thus is rightly called a “Harriman flat car.” Below is a good photo of one of the later classes in service at San Diego, Class F-50-8 car SP 38892, photographed by Chet McCoid on September 26, 1954 (Bob’s Photo collection).
The important things to notice about this car are the straight side sill, the blocking between the stake pockets which supports the wide deck reaching out to the outer edge of the stake pockets (called an “overhanging deck”), and the fishbelly center sill. All these features are well captured by the Owl Mountain Models kit for these cars (see my review of this nice kit at: https://modelingthesp.blogspot.com/2017/09/building-owl-mountain-flat-car.html ).
After World War II, SP turned to American Car & Foundry, and adopted their flat car design for several car orders. I went into some detail about these in the column. The most important cars were the 53-ft., 6-in. long ones, classes F-70-6 and -7, the latter a class of 2050 cars. Both classes are well represented by the Red Caboose HO scale model (dies now owned by the SP Historical & Technical Society, or SPH&TS, who have done a few re-runs of this model).
Among the most characteristic loads carried by these flat cars in the 1950s was lumber, as part of a nationwide building boom. Shown below on my layout is a Red Caboose Class F-70-7 car with an Owl Mountain Models lumber load (for more on my building of this load kit, see: https://modelingthesp.blogspot.com/2014/08/open-car-loads-lumber-from-owl-mountain.html ).
I also described a few details about modifications to these flat cars by SP. An important modification was the addition of bulkheads for plasterboard service. In 1949, SP began adding low bulkheads to some of its new flat cars, and the SPH&TS has offered a really nice kit to duplicate these bulkheads (see my review at: https://modelingthesp.blogspot.com/2012/07/modeling-sps-bulkhead-flat-cars.html ). Here is a Red Caboose flat car with these bulkheads, being moved by a Baldwin road-switcher on my layout.
Loads in the earliest days were usually tarped rather than wrapped, but by 1953, wrapped loads were appearing. Here is my bulkhead flat car with a load made by Jim Elliott. Incidentally, loading plasterboard to the height of these bulkheads did amount to a nominally 70-ton load, the capacity of the cars, so there was a reason for the low bulkheads.
In 1953 and later, SP also converted dozens of Class F-70-7 flat cars for introduction of piggyback service, which began in June 1953. I showed prototype photos and some models, comparable to a recent post in this blog, which is at: https://modelingthesp.blogspot.com/2024/10/sp-piggyback-part-4-progress-on-3d.html .
Finally, I briefly covered some of the SP heavy-duty flat cars, the F-125 depressed-center cars and the F-200 four-truck cars. As those have been covered in some detail in my blog posts, I won’t go into them here. If you’re interested, the following posts can be consulted, along with the MRH article:
F-125: https://modelingthesp.blogspot.com/2024/05/an-sp-class-f-125-1-flat-car-part-2.html
F-200: https://modelingthesp.blogspot.com/2020/05/sp-200-ton-flat-cars-part-5.html
It was interesting to review prototype information and modeling resources to write a summary about SP flat cars of the early 1950s. I hope it was of some interest or value to MRH readers.
Tony Thompson
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