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In the runaway of QNS&L train number LIM-55, described in the link I posted above, the guidelines called for 12 handbrakes.  The engineer, using his own discretion, applied 35 handbrakes, and the train ran away before he got back to the cab.  Another guideline called for 57 handbrakes on that train. Quote from the report (my emphasis in red): If a train stops on the descending grade between Bybee and Tika following an emergency brake application, it must be secured in accordance with CROR Rule 112. That rule states that a sufficient number of hand brakes must be applied to ensure that the train is secured. Rule 112 special instructions specify the minimum number of hand brakes to be applied under general operating conditions, but do not give a number when specific conditions apply. It is left to the locomotive engineer's discretion to determine if additional hand brakes are required while taking into account such factors as train weight, track grade and braking force. In this occurrence, for LIM-55, consisting of 112 cars, the minimum number of hand brakes required by Rule 112 was 12 (<a title="see appendix a" href="http://www.bst-tsb.gc.ca/eng/rapports-reports/rail/2011/r11q0056/r11q0056.asp#appendix-a">Appendix A</a>); however, the locomotive engineer indicated having applied 35 hand brakes on LIM-55 after taking the track profile and train specifications into consideration. As a result of testing performed following the 1996 Edson, Alberta, accident (TSB report R96C0172), a table was established to provide the necessary number of hand brakes required to secure 100 loaded cars according to the track grade and hand-brake torque (<a title="see appendix b" href="http://www.bst-tsb.gc.ca/eng/rapports-reports/rail/2011/r11q0056/r11q0056.asp#appendix-b">Appendix B</a>). When this table is used for LIM-55, according to a torque of 80 foot-pounds on an average grade of 1.3%, 57 hand brakes would be necessary to secure the train between Bybee and Tika. Similarly, in the Rockies, on such grades, Canadian Pacific Railway's special instructions require that half the hand brakes be applied on a train with similar characteristics as LIM-55.
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