The trains manufactured and marketed by Louis Marx & Co. in the prewar and postwar eras deserve more attention from toy train collectors and operators alike. Many mysteries surround these colorful models, and six Classic Toy Trains articles by experts in the field have sought to solve those puzzles. Maurice Demers investigates the popular “six-inch tin” trains dating from the 1930s and early ‘40s. James Flynn directs his attention (and ours) to a scarce military train set from World War II, the reuse of tin lithography for trains, and tips on how to identify a genuine factory prototype.