Hi,
Here is a photo from Pennsy Power page 116.
Your description of the lower quadrant fail safe is correct.
If you look at the second semaphore from the left, it is horizontal. The pivot point is in the upper right corner though so it is ALSO a fail safe signal. If I knew this before, I had forgotten it. Sorry about the misinformation.
Doug vV
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Carrie Fisher quotes:
Instant gratification takes too long.
I was street smart, but unfortunately the street was Rodeo Drive.
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Luna Lovelace (Harry Potter):
I sleepwalk you know that's why I wear shoes to bed.