1 types 1.1 flat yard 1.2 hump yard 1.3 gravity yard types flat yard flat yards constructed on flat ground, or on gentle slope. freight cars pushed locomotive , coast required location. cnw towerman r. w. mayberry operates retarders @ proviso yard in chicago, illinois, may 1943. hump yard not cars can sent on classification hump. union pacific track maintenance vehicle permanently labelled not hump , because not designed withstand hump sorting. hump yards largest , effective classification yards, largest shunting capacity, several thousand cars day. heart of these yards hump—a lead track on small hill on engine pushes cars. single cars, or block of coupled cars, uncoupled before or @ crest of hump, , roll gravity onto destination tracks in tracks cars sorted, called classification bowl. the speed of cars rolling down hump classification bowl must regulated according whether full or empty, heavy or light freight, varying number of axles, whether there few or many cars on classification
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