Engineer Training

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Front #10

ABTH 103.6.3E

List, in order, the steps to slow or control train speed by using throttle modulation in a sag or undulating grade.

Reduce the throttle as the rear of the train approaches the ascending grade.
As you approach the sag, reduce throttle as necessary to control train speed.
Continue to increase the throttle as the train ascends the grade.
Reduce the throttle further as the head end of the train begins descending.
Just before the head end of the train reaches the ascending grade, increase the throttle.

Back #10

Flag

ABTH 103.6.3E

Answer: 1. As you approach the sag, reduce throttle as necessary to control train speed. 2. Reduce the throttle further as the head end of the train begins descending. 3. Just before the head end of the train reaches the ascending grade, increase the throttle. 4. Continue to increase the throttle as the train ascends the grade. 5. Reduce the throttle as the rear of the train approaches the ascending grade.

Feedback:
Knowing where the entire train is (rear end) in relation to the sag or undulating grade is important here. As the head end of the train approaches the ascending grade, increase throttle before it reaches the grade in order to build some momentum.