The ISO 5948 PDF document typically includes the following content:

Because ISO standards are protected by copyright, you generally cannot find a legal, free PDF download. You can obtain the official document through these channels:

Before prototyping, use optical software (e.g., LumenRT or TracePro) to simulate the required luminous intensity distribution per Clause 7. The ISO 5944 PDF includes a polar diagram (Figure 2) that you can overlay onto your simulation results.

The standard provides a comprehensive framework for identifying internal discontinuities and assessing the "ultrasonic permeability" (the material's ability to transmit sound waves) of rail components.