On 28 December 2016, we visited Norfolk Southern Railway's Enola Hump Yard in Harrisburg, Pennsylvania. We viewed some humping operations, the engine yard, and an Autorack train pulling out.
The main principle of a hump yard is simple: use gravity to more efficiently do the work of a switcher locomotive. A locomotive pushes cars up a hill, called a "hump", at the crest of which a man called the pin-puller uncouples each car. The car then rolls freely down the hump into the classification bowl. On the way down, brake shoes called retarders clamp hold of the wheel, slowing the car down. As it nears the bottom of the hump, switches controlled by an operator in a tower are thrown to put the car on the correct track for its destination. Usually, one track is designated for each outbound train. One all the cars for a train have been sorted in this manner and are on the right track, engines are coupled on and the train pulls out.
Click here to find out more about Enola Yard: www.ble-t.org/p...
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7 сен 2024
