TRAINS, LARGE RAILWAY SORTING YARDS, THE ART OF PUNISHMENT A FASCINATING SHOW
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With goods, or now "freight", everything has to be done: loaded, unloaded and since they remain stupidly in their wagon and are unable to change trains en route and take a connection, the wagon has to be made to go where they need to go. This mental and endemic inertia of goods has required, since the origins of the railway, special installations for sorting wagons and others for filling and emptying them. Which has given us the fascinating and spectacular spectacle of marshalling yards that every amateur must have, at least once in his life, spent hours scrutinizing, captivated by the spectacle of the wagons rolling down the marshalling mound and wisely going to line up in their place that an invisible organizer had prescribed for them. The secret or, let's say, the great technical feat of marshalling yards is what is called "shooting on goal". It is very simple to describe but not to practice: the wagons to be sorted are uncoupled and, still forming a train, are all pushed together by a shunting locomotive to the top of a small artificial hill, called a "mound" or "sorting hump" which will allow them, once detached, to descend freely, rolling alone, or in "coupons" of two or three, on the interminable formation tracks of the yard. Oriented by the track devices that they cross, they will join the other wagons with which they will form a new train, each formation track corresponding, as you will have guessed, to a given destination that this new train will take. The art of "shooting on goal" is to make these free wagons roll at the exact speed that will make them come, smoothly, to a stop exactly where they need to, their buffers coming gently into contact with those of the last wagon of the waiting train and not causing a brutal shock. In a marshalling yard, we therefore find what are called "receiving tracks", grouped into one or more bundles, "marshalling tracks", also grouped into one or more bundles, "formation tracks", which can be integrated into the marshalling bundle or independent of it, "departure waiting tracks", grouped into one or more bundles or, for smaller installations, simply integrated into the marshalling bundle.
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