This Athearn 1924-1:75 O Scale Bettendorf Sprung 2 Rail Train Trucks Model Railroad is a great addition to any model train enthusiast's collection. The train trucks are pre-built and ready to go, with a gray color and made of diecast material. The scale is O and the gauge is also O, making it compatible with many other parts and accessories. The brand is Athearn and the type is train trucks, perfect for adding to your model railroad.