Metal fully sprung equalized trucks mount with a #2 or 2-56 screw, sold separately. The Pennsylvania Railroad Class 2D-F8 50-ton freight truck was originally manufactured in the 1920s with a riveted bolster but this release represents the style introduced in the 1930s which included a cast steel bolster. This type of truck was in faithful service for more than fifty years. Truck Features: * Self Centering Action - Trucks self align themselves parallel with the car for easier placement on track * Code 110 (.110) 33 ribbed back wheels * Accurate markings * Incredible detail true to prototype * Non-magnetic metal wheels * Highly flexible sprung trucks * Metal side frames and fully sprung bolster * Smooth tracking free rolling contoured insulated axles * RP-25 free rolling wheels