Broken weld, repair date in image.
CKT!
Rushed weld job, no heat treating of the rail.
304L deposition steel gives a standard, martensite-free microstructure. Heat treating the repaired rail increases hardness and eliminates the micropores. Preheating may mitigate the developed microcracks at the rail-deposition interface.
Dang: The Chinese-Made Bay Bridge Continues to Fall Apart
https://prosperousamerica.org/cpa-interview-bay-bridge-dangerous-due-to-chinese-steel/
https://www.materialsperformance.com/articles/material-selection-design/2015/11/failed-anchor-rods-on-the-san-francisco-oakland-bay-bridge-a-corrosion-discussion
https://www.structuremag.org/?p=11041