Metal fully sprung equalized trucks mount with a #2 or 2-56 screw, sold separately. The ASF(R) 100-ton roller bearing truck is from the modern diesel era. It has standard 36-inch wheels and a longer wheelbase than the 50- or 70-ton roller bearing trucks. This model is a faithful reproduction of the American Steel Foundries(R) Ride Control(R) truck. This truck is currently in use under a variety of rolling stock in North America. Truck Features: * Self Centering Action - Trucks self align themselves parallel with the car for easier placement on track * Code 110 (.110) 36 smooth 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