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Dakguy201, The objective is to set enough handbrakes to hold the train with air brakes fully released. An empirical test is used to determine whether enough handbrakes have been applied to hold a train on a grade.  One version of such testing is to apply enough handbrakes expected to hold the train, and then release the air brakes.  If the train does not move, it is considered to be adequately secured with handbrakes. Another version of the test is to apply enough handbrakes expected to hold the train, then release the air brakes, and push and pull on the train.  If the train does not move, it is considered to be adequately secured with handbrakes. This is the actual push-pull test.  I do not know if the term is also applied to the test where no pushing or pulling is done.  Doing the test with the push-pull component gives some sense of measure of a safety factor by feeling the train’s resistance.  Without the push-pull component, if the handbrakes hold the train, it may be only by the tiniest margin, and offer no indication of that. I do not know if special instructions indicate how much force to apply when pushing or pulling to see if the handbrakes are sufficient.
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