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[quote user="oltmannd"] [quote user="Bucyrus"]Guessing about what?  Are you referring to my conclusion that a verification test in which verification is impossible is 100% worthless? [/quote] Yes. You were putting words in their mouth.  NOW you say it's "your" conclusion... If a block signal is not 100% reliable, is it worthless?  If so, why do we have them?[/quote] I quoted their statement and I said what it “has to mean” due to their use of the term “impossible.”  I did not attribute my conclusion of the test being worthless to the STB as though it was their statement.  So I did not “put words in their mouth,” as you say. The statement by the STB is not analogous to the fact that signals can fail.  Their use of the term “impossible” would be analogous to saying that signals always fail.  So, yes, if it is "impossible" for a block signal to work properly, then I would conclude that it is worthless.
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