"The resulting accumulation of weld flash at the base served as an adequate stress concentration to initiate fatigue cracking while the rail was under cyclic loading." When interviewed by the NTSB ...

and the compromise kit includes a mold that is designed to ensure that the difference in rail profiles does not create a gap at the base of the rail that can allow weld flash to pool under the rail." ...

The National Transportation Safety Board has released its final report on a deadly 2023 train derailment north of Pueblo. Here's what it concluded.