What is the rim of a train made out of?

The rim of a train wheel, often referred to as the wheel flange, is typically made from high-strength steel. This material is chosen for its durability and ability to withstand the significant stresses and wear associated with rail travel. The rim may also undergo heat treatment to enhance its hardness and resistance to deformation. In some cases, specialized alloys or coatings may be used to improve performance and longevity.