Following responses from numerous discussions/arguments with (mostly older) "train guys" as to whether American Flyer trains had two or three rail track, it seemed some clarification was in order. It also appeared that, while the post-war "S" gauge two-rail period is quite well covered, there is very little information still in print on their immediate ancestors. The purpose of this little guide is to present, to the people who are unaware of their existence, the three-rail "Tru-Model" toy trains of the A. C. Gilbert Company, of New Haven CT, which were introduced at the 1939 New York World's Fair, and which were produced until the war-imposed shutdown of non-essential manufacturing, in July 1942. Dimensions and color schemes are provided, throughout the work. Wheel arrangements follow the Whyte system of course. Lengths given exclude couplers. Locomotive lengths given include the proper tender. At LEAST one large color photo is included for EACH distinct item, and EVERY set is illustrated in catalog format, in color! Captions are self-explanatory. All (220+) photographs were taken by the author, of specimens from his personal collection, unless specifically credited otherwise. While an attempt was made to show 'better-grade, collectible' specimens, the cars are representative of vintage TOYS, and are not intended to represent the pristine, mint-in-the-box, items available to only a very wealthy few.It should be noted that when Gilbert brought American Flyer in 1938 there was a substantial amount of salable (but non-scale) "Chicago" inventory on hand. Prior to that time, most toy trains, in general, were quite unrealistic in appearance, particularly car length. If you wanted more realism, you had but one choice - build from scratch! This guide does NOT cover ANY of that pre-1940 "Chicago Flyer" material! The 1939 American Flyer catalog first introduced the die-cast 3/16" scale equipment, but only in the four most expensive sets, with would become the two top-of-the-line locomotives. By 1940, the conversion to 3/16" scale (including the first pressed-steel cars) was well under way, but it was not until the 1941 catalog that ALL offerings were of Gilbert's new 3/16" scale design. The first post-war catalog (for1946) does not list the very limited remaining stock of "O" gauge trains which was sold off as soon as possible so as to concentrate on the brand new - and more exciting - two-rail lineup.There is some intentional redundancy in the descriptions, si