An Onsite Review and No F125’s
On the evening of Friday, December 1, 2017 a visit was made to the San Bernardino stop, for probably four hours or so, and NO F125 units were seen.

It is presumed NO F125’s were out and about running in the system, or if they were, their numbers were so few as to be insignificant.
So, the F125 failure recently and the resulting humiliation of the Metrolink boss may be having more of an impact than first thought.
At this person’s first arrival in San Bernardino, the public address system was announcing a certain numbered train was 15 minutes late because of ‘signal issues.’ Whatever the signal problem was, it had a rippling effect, with some arriving trains getting 45 minutes late.
One departed train to Los Angeles returned about 20 minutes later. Presumably, it met a late train at Rialto or Fontana, switched passengers, and probably crews too, and at least one run was somewhat on time again. So, the night in question more than F125’s were a troublesome issue.
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K.P.’s absolute “theorem” from early, early childhood that he has seen over and over and over again: Those that CAUSE a problem in the first place will act the most violently if questioned or exposed.