The standard specifies the requirements for the ultrasonic inspection of railway rolling stock axles . It ensures that the steel used in train axles is free from internal defects that could lead to catastrophic failure during high-speed travel. The Axle’s Silent Watchman: A Story of ISO 5948
To understand why this standard matters, let's examine its core technical clauses (as found in the official ISO 5948 PDF). iso 5948 pdf