What type of defect is classified as speed defined?

The type of defect classified as "speed defined" pertains specifically to conditions or issues that have an impact directively tied to the operational speed of a train. This means that such defects can alter how a train is expected to function at various speeds or can pose safety concerns based on the speed at which the train operates.

For instance, certain track conditions or defects can be safe at lower speeds but become hazardous at higher speeds, thereby necessitating a classification that considers the speed of the train. This attribute makes "speed defined" defects particularly important in railway safety and operational guidelines, as they directly influence the safe operation of trains under specific conditions.

Understanding this classification allows railway personnel to prioritize inspections, maintenance, and safety measures in a way that directly addresses the risks associated with different train speeds, thus ensuring safer travel and adherence to operational limits.