Determining the kinematic parameters of railcar motion in Hump yard retarder positions

Hump yards perform the engineering function of train shunting and departure, moving and accumulating cars in the yard, etc. Hump yard designs, to ensure safe railway operations, should take into account the kinetic dynamics of rolling stock and individual railcars. The theorem of change in the kinetic energy of a point object was used to obtain formulas for determining the braking distance of a railcar in the braking area of a hump yard. This research also shows why using the formula for the free fall rate of a body accounting for the inertia of rotating parts to determine a railcar's velocity in the braking zone is incorrect. The results obtained showed accuracy in the range from 3.7 to 1.52%, which is within an acceptable accuracy window for engineering calculations.

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