Have been doing some research on railroad yards and came upon - TopicsExpress

Have been doing some research on railroad yards and came upon various types of which the hump yard is quite interesting. These are the largest and most effective classification yards, with the largest shunting capacity, often several thousand cars a day. The heart of these yards is the hump — a lead track on a small hill over which an engine pushes the cars. Single cars, or a block of coupled cars, are uncoupled just before or at the crest of the hump, and roll by gravity onto their destination tracks in the tracks where the cars are sorted, called the classification bowl. I wonder if this has ever been modelled. Following video is an excellent demonstration (in time lapse). youtube/watch?v=qo-MquqQ7Mw&src_vid=6nz-n49pIFQ&feature=iv&annotation_id=annotation_931084

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