A helix train unloader including: a dumping apparatus having an entrance arranged to receive a railcar in an upright condition from a leading track portion, and an exit arranged to deliver the railcar in an upright condition to a trailing track portion; wherein the dumping apparatus includes at least one spiral guide running from the entrance of the dumping apparatus to the exit of the dumping apparatus, the spiral guide being located to engage the railcar and to thereby cause rotation of the railcar about a longitudinal axis of the railcar as the railcar passes through the apparatus along the spiral guide, rotating the railcar from the upright condition at the entrance of the dumping apparatus to a tilted condition in which bulk contents of the railcar drop from the railcar under gravity, and then returning the railcar to the upright condition at the exit of the apparatus.
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