The classifications given by railroads to their steam locomotive fleets were as varied as the machines themselves with several different designations within a particular class! Frisco steam locomotives were likewise distinguished by a wide range of numerical classes (the SLSF was one of few railroads of its day to distinguish its steam types by numbers rather than letters). In any event, the information here is most certainly not a complete, all-time listing of the Frisco's steam fleet and also is merely meant to list the general types of steam locomotives operated by the railroad.
The St. Louis-San Francisco Railway, commonly known as simply the Frisco has a storied history of two halves. During the railroad’s first 60 years it had a very interesting and tumultuous history going through a number of name changes and bankruptcies (resulting in so many names). However, after its final name as the St. Louis-San Francisco, the railroad did quite well and prospered for its last 60+ years of operation before becoming part of the large Burlington Northern system in the very early 1980s.
While the St. Louis-San Francisco Railway was a regional Class I in nature it did operate some large steam locomotives including 4-8-4 Northerns, 4-8-2 Mountains, and 2-8-2 Mikados. Today, sevearal Frisco steam locomotives survive preserved (nearly two dozen!) and displayed although a few are currently undergoing some type of restoration. For information about these surviving steamers please click here.
Class 337, 354, 359, 361
These classes included Frisco's fleet of 2-6-0 Moguls.
Class 742
The Frisco's Class 742 included its fleet of 4-6-0 Ten-Wheelers.
For more on the St. Louis-San Francisco Railway and its steam locomotives you may want to consider the book Frisco In Color from Louis Marre and Morning Sun Books. The book gives an excellent colorful, pictorial history of the railroad and is highly complemented by the superb image quality provided in all Morning Sun publications. If you have any interest in the Frisco I'm sure you will enjoy Marre's book very much. If you're interested in perhaps purchasing this book please visit The Railroad Diamond by clicking the tab in the menu to your left marked "TRD Store".