Kadee / A.S.F.(R) Ride Control(R) 50-Ton Fully Sprung Metal Trucks in HO Scale (Part # 380-504). These trucks come with Code 110 (.110 wide) 33' smooth back RP-25 wheels. They mount with a #2 or 2-56 screw. The A.S.F. A-3 Ride Control 50-ton freight truck, introduced in the 1940s, is a precursor to modern freight trucks. It features longer spring travel, no spring planks, and constant friction control to reduce lateral roll and increase train speed safely. By 1949, ASF sold over 140,000 sets. This AAR truck is great for modeling from the transition era up to 1994. Truck features include accurate markings, incredible detail true to the prototype, non-magnetic metal wheels, highly flexible sprung trucks, metal side frames, a fully sprung bolster, smooth-tracking free-rolling contoured insulated axles, and RP-25 free-rolling wheels.

Using these trucks is easy. First, mount them with a #2 or 2 - 56 screw. They're designed to provide smooth movement for your model train. When handling, be careful not to damage the delicate parts like the wheels or the spring system. For maintenance, clean the wheels regularly to keep them rolling freely. You can use a soft cloth to gently wipe away any dirt or debris. Store the trucks in a dry place to prevent rusting. Also, avoid exposing them to strong magnets as the wheels are non - magnetic. With proper use and care, these trucks will serve you well for a long time in your model train setup.