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[quote user="oltmannd"] [quote user="Bucyrus"] “Because it is impossible to verify hand-brake effectiveness by pulling or pushing cars on high grades, locomotive engineers cannot accurately know that management's expectations have been met every time cars are secured in accordance with CROR Rule 112.”   This is amazing.  If the empirical test is unreliable, you don’t have a safe and reliable means to secure trains with handbrakes.  [/quote] "not being met EVERY time" <> reliable.  It it possible to have a reliable system the does not work properly EVERY time.  Block signals are a good example.  You have to define the term "reliable", however.[/quote] The term “unreliable” was my term, but it is a bit of a euphemism because I did not want to go too far out onto a limb.  I agree that term, unreliable leaves open the question of degrees of reliability, and in the final analysis, nothing is 100% reliable. However, the actual statement by the TSB was that it is “impossible to verify hand-brake effectiveness by pulling or pushing cars on high grades,”   Since the only point of the test is to verify, their statement that verification by the test is “impossible” has to mean that the test is so far from perfect that it is 100% worthless.  So it fails to work properly every time.
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