In railways, the profile of the wheel is the protruding part that will provide minimum friction while rolling on the rail and will not derail by resisting the horizontal and vertical effects that will occur while standing.
Boden has passed from English to our language and technique as a term. English "Flange“. It literally means protrusion in Turkish. If we explain it as a technical term: Boden is the protruding part of the wheel that allows the train to move forward without derailment. The standards have given detailed information about the height and thickness of the flange of each wheel.