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[quote user="jeffhergert"] [quote user="Bucyrus"] Why does the Canadian TSB say that is unreliable?[/quote] Maybe because it's the simplest explanation.  Since the procedure was followed and it moved anyway, the test must be flawed or unreliable. [/quote] Jeff, Thanks for that clarification about adding a safety factor.  Regarding the statement by the TSB of Canada, when you say that “maybe because it’s the simplest explanation,” do you mean explanation of the Lac-Megantic runaway?   Actually the TSB made their statement in 2009, so it is not a response to the Lac-Megantic wreck.  In 2009, they said this: “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.”
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