What size crack in a side frame or bolster warrants condemnation?

A crack measuring 1/4 inch in a side frame or bolster is significant enough to warrant condemnation because it can compromise the structural integrity of the rail vehicle. Side frames and bolsters are critical components that support the weight of the railcar and ensure stability during transit.

Cracks in these areas can lead to catastrophic failure, affecting safety and operational reliability. The 1/4 inch threshold is established based on engineering standards and safety protocols, which consider the potential for growth and the overall stress that the component experiences during operation.

Larger cracks, such as those measuring 1/2 inch or more, represent an even greater risk but 1/4 inch is the established limit for condemnation, indicating that any detectable crack of this size or larger can no longer ensure safe performance under normal operating conditions.