Note the straight "passenger" pilot on the PRR F3 in the photo. With the exception of a handful of initial order F3 and E7 A units, follow on orders by the PRR for F3, F7, FP7, E7, and E8 A units specified straight pilots equipped with coupler shrouds. Coupler shrouds were removed in the 1955/6 time frame. With the many detail and lettering variations/modifications on PRR F units over the years, IMO the only way to achieve a reasonable degree of prototype accuracy is to first pick the batch being modeled, and then adjust the details to the time frame being modeled using dated photos. Fortunately a wealth of information on PRR F units can be found in a lengthy 2 volume article in the PRRT&HS's The Keystone several years ago.
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