Hutchison Effect & Teslas Whompy Wheel issue The exact cause of the Hutchison Effect is unknown in public spheres as it is classified under national security. However the most likely culprit seems to be a combination of electromagnetic sources coming together in a way to change the makeup of metals leading to their softening, fracturing, and complete breaking. Keep in mind how much metals are within our buildings and infrastructure...even in concrete.
Hutchison Effect and not cold weather caused this section of rail line to break off.
If cold temperatures were the cause, then rail lines in cold weather regions, only cold weather regions, would be breaking all over the place. However a more likely scenario is the Hutchison effect caused the fracturing of the rail line and the cold plus a previous train helped the section break away. Thus the cold "contributed" but was not actually the cause. Scientific study on how Hutchison effect fracturing metals is in my post about the Hutchison Effect linked above. By all means, continue to use the Tesla factory as the scapegoat for "substandard" parts. Hutchison Effect occurs regardless.