It was fascinating watching the same train going the same way in two places at once! Even on the Copper Canyon (Mexico) you don't see that, at least not with the passenger train, and not on the Tehachapi Loop.
All that flange squeal tells us the line wasn't designed with 60-80 foot cars. They were wise to use B+B power, C+C units are known to shave steel off the rails. Wonder if they checked for shavings after that run.
Guess there's a prototype for everything!
:B~)