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This foldout pamphlet catalogue was included in some 1975 sets like the Round-Trip Plarail 3D Loading and Unloading Set. The front shows a large layout with a comment from Junichi Oishi, Assistant Professor of Psychology at Kansai University, saying that Plarail is one of the few "authentic" toys that allow much participation, ingenuity, and creativity in play. Many of the new sets for 1975 and some earlier sets that remained on sale are also shown - I think most of these older sets had more than one production run and lasted long enough to have variant boxes or toolings, unlike many 1970s Plarail sets that appeared and disappeared.
The range of real-life trains depicted in the Plarail range was starting to round out nicely, with more express trains like the Sleeper Express and Panorama Express appearing in the early 1970s as well as many new locomotives like the DD51 Diesel Locomotive, EF-58 Electric Locomotive, and the ED-70 Electric Locomotive, the first Round-Trip Plarail locomotive. Since the early 1970s now-staples like the Turnout Rail and Half Straight Rail joined older rails like the Tansen point rail and Y type rail. Accessories include the grand old four-way points and Turntable and short-lived and long-standing stations, and a few odd smaller accessories like the brief "automatic" signals and old toolings for the original crossing gate and the American-style railroad crossing signs, basic signals, and "flyswatter" electrical pole originally borrowed from Tot Railroad with light blue crossover peces.
The back of the pamphlet shows how to make your own Plarail. It shows how to start with a basic set and add accessories, rail, and elevation to expand it out.