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The MM&A uses the special instructions for handbrakes that are used by Canadian Pacific Ry.  Since the runaway, CP has made some two-dozen changes to the handbrake section of the General Operating Instructions.  The company removed a chart that gave minimum hand brake requirements for trains based on the number of cars. That chart had said a minimum of nine hand brakes were needed on a train with 72 cars. According to the article linked below, the CP has replaced the chart with new rules that say hand brakes must now be applied on at least 25 percent of the cars for trains parked on a slope of 1.2 percent (which is the grade of the tracks outside of Lac-Megantic); unless the brakes have been properly tested. I don’t understand what they mean by saying “unless the brakes have been properly tested.”  I assume that “tested” refers to the push-pull test required by CROR Rule 112.  Why would the brakes not have been properly tested? So, does that mean Rule 112 is now only an option, and if you choose to exercise it; and if it's push-pull test shows that less than 25% is satisfactory; then you are free to ignore the requirement of setting 25% and are permitted to set only the number of handbrakes required by the push-pull test? And by the same token, are you free to not to exercise Rule 112 with its push-pull test if you set 25% of the handbrakes? If that is the proper interpretation of what they have changed, it seems like a big change in the rule logic.  It would amount to an option of using either of two different methods, and the two methods will not necessarily yield the same result.     <a href="http://www.reuters.com/article/2013/07/19/us-train-probe-idUSBRE96I0OO20130719">http://www.reuters.com/article/2013/07/19/us-train-probe-idUSBRE96I0OO20130719</a>
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