These Kadee / Bettendorf 50 - Ton fully sprung self - centering metal trucks are a great addition to your HO scale model train collection. They come with Code 110 (.110 wide) 33' smooth - back RP - 25 wheels. You can mount them with a #2 or 2 - 56 screw. The Bettendorf Truck, introduced in the 1930s on U.S. railroads, was an AAR standard truck and was used in interchange service until 1993. These trucks represent 50 - ton trucks for 100,000 - pound cars. Key features include accurate markings, self - centering design, incredible detail true to the prototype, non - magnetic metal wheels, highly flexible sprung trucks, metal side frames and a fully sprung bolster, smooth tracking with free - rolling contoured insulated axles, and RP - 25 free - rolling wheels.

Using these trucks is easy. Just use a #2 or 2 - 56 screw to mount them on your model train. When handling, be gentle as the trucks are made of metal and can be damaged if dropped or hit hard. For maintenance, keep them clean. You can use a soft brush to remove dust and debris. Check the wheels regularly to make sure they roll freely. If you notice any issues with the self - centering function, inspect the springs and axles for any signs of damage or misalignment. Store them in a dry place to prevent rusting. With proper care, these trucks will serve your model train well for a long time.