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[quote user="jeffhergert"] [quote user="Bucyrus"] [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.”[/quote]I mean in response to the TSB's statement when ever it was made.  They must figure if it (P/P test) was done and didn't work, it must therefor be unreliable.Jeff[/quote] Jeff, They did make the statement about the unreliability of the push-pull test in a report on an earlier runaway, but they did not link the issue to that specific runaway.  So it is unclear why they even mentioned it there in addition to the question of what they mean by saying that the test is unreliable.  In that runaway, the engineer started having trouble controlling the train on a down grade, so he made an emergency application.  Once stopped, that called for setting handbrakes to hold the train during the recharge.  The minimum number of handbrakes called for was 12.  He set 35, but the train started to roll before he got back to the cab.  He made it into the cab and put it into dynamic braking, but that did not hold it.  The train finally stopped when the track leveled out.  So the push-pull test never came into play during the incident.  The TSB comment is in this report of the runaway:  <a href="http://www.bst-tsb.gc.ca/eng/rapports-reports/rail/2011/r11q0056/r11q0056.asp">http://www.bst-tsb.gc.ca/eng/rapports-reports/rail/2011/r11q0056/r11q0056.asp</a> The comment is at the end of the section called, Train securement between Bybee and Tika.
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