DB wrote:
"It looks like it either it was cut out or it was pulled apart where two rails were joined."
Rails can break or come apart at joints (they call these "pull-aparts"), but a section a couple of feet long wouldn't just remove itself.
When such things happen, track circuits will go down, forcing oncoming trains to reduce to a very low speed (typically 15mph).
Having said that, rails have been known to break under the weight/momentum of a passing train - often with bad results.
The trains (at least the high-speed one) probably have forward-facing cameras in the cab, "looking ahead" and recording what the engineer/driver sees. Amtrak had these on all road engines back when I was still running them.
These days, there are "inward-facing" cameras as well, watching the engineer at all times. Glad I'm not working there any more.
I recall another bad high-speed train wreck in Spain some years' back, that one was attributed to operator error.
If there were nose cameras, and if the video can be recovered, that will reveal what transpired in the moments before the accident.