@Rich Melvin posted:A sun kink...
This is the type of track condition reportedly being focused on as the cause of this accident. How the kink (as it is known in the industry) was formed has yet to be determined. Some possible factors could be extreme temperatures, improper CWR installation, damage from outside interference such as heavy equipment disturbing the roadbed, or severe slack action from a preceding train, to name a few.
Regards,
C.J.