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Front #26
ABTH 103.7.3
Before passing the summit of a mountain grade, ensure that the rear car brake pipe pressure is within ____ psi of the regulating valve setting.
Answer: 15Feedback: Look at the rear brake pipe pressure before passing the summit of a mountain grade. On BNSF freight trains, the regulating valve is set at 90 psi, so the brake pipe pressure on the rear car needs to be 75 psi or higher..